kernel: ltq-vdsl-vr11: fix compilation waring

kernel: ltq-vdsl-vr11: fix compilation waring

Add patch fixing compilation warning from missing fallthrough
Fix compilation warning:
/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-arm-openwrt-linux-muslgnueabi_musl/linux-ipq40xx_generic/dsl_cpe_api-ugw_8.5.2.10/src/common/drv_dsl_cpe_api.c: In function 'DSL_DRV_AutobootControlSet':
/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-arm-openwrt-linux-muslgnueabi_musl/linux-ipq40xx_generic/dsl_cpe_api-ugw_8.5.2.10/src/common/drv_dsl_cpe_api.c:2648:19: error: this statement may fall through [-Werror=implicit-fallthrough=]
 2648 |                if (pContext->bAutobootThreadStarted)
      |                   ^
/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-arm-openwrt-linux-muslgnueabi_musl/linux-ipq40xx_generic/dsl_cpe_api-ugw_8.5.2.10/src/common/drv_dsl_cpe_api.c:2656:13: note: here
 2656 |             case DSL_AUTOBOOT_CTRL_STOP_PD:
      |             ^~~~
cc1: all warnings being treated as errors

/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-arm-openwrt-linux-muslgnueabi_musl/linux-ipq40xx_generic/dsl_cpe_api-ugw_8.5.2.10/src/pm/drv_dsl_cpe_pm_core.c: In function 'DSL_DRV_PM_CountersReset':
/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-arm-openwrt-linux-muslgnueabi_musl/linux-ipq40xx_generic/dsl_cpe_api-ugw_8.5.2.10/src/pm/drv_dsl_cpe_pm_core.c:2358:7: error: this statement may fall through [-Werror=implicit-fallthrough=]
 2358 |    if (ResetType == DSL_PM_RESET_HISTORY)
      |       ^
/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-arm-openwrt-linux-muslgnueabi_musl/linux-ipq40xx_generic/dsl_cpe_api-ugw_8.5.2.10/src/pm/drv_dsl_cpe_pm_core.c:2361:4: note: here
 2361 |    case DSL_PM_RESET_TOTAL:
      |    ^~~~
/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-arm-openwrt-linux-muslgnueabi_musl/linux-ipq40xx_generic/dsl_cpe_api-ugw_8.5.2.10/src/pm/drv_dsl_cpe_pm_core.c:2365:7: error: this statement may fall through [-Werror=implicit-fallthrough=]
 2365 |    if (ResetType == DSL_PM_RESET_TOTAL)
      |       ^
/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-arm-openwrt-linux-muslgnueabi_musl/linux-ipq40xx_generic/dsl_cpe_api-ugw_8.5.2.10/src/pm/drv_dsl_cpe_pm_core.c:2368:4: note: here
 2368 |    case DSL_PM_RESET_HISTORY_SHOWTIME:
      |    ^~~~
cc1: all warnings being treated as errors

/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-arm-openwrt-linux-muslgnueabi_musl/linux-ipq40xx_generic/dsl_cpe_api-ugw_8.5.2.10/src/device/drv_dsl_cpe_device_vrx.c: In function 'DSL_DRV_DEV_AutobootHandleTraining':
/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-arm-openwrt-linux-muslgnueabi_musl/linux-ipq40xx_generic/dsl_cpe_api-ugw_8.5.2.10/src/device/drv_dsl_cpe_device_vrx.c:8883:19: error: this statement may fall through [-Werror=implicit-fallthrough=]
 8883 |          bPreFail = DSL_TRUE;
      |          ~~~~~~~~~^~~~~~~~~~
/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-arm-openwrt-linux-muslgnueabi_musl/linux-ipq40xx_generic/dsl_cpe_api-ugw_8.5.2.10/src/device/drv_dsl_cpe_device_vrx.c:8889:7: note: here
 8889 |       case DSL_LINESTATE_EXCEPTION:
      |       ^~~~
cc1: all warnings being treated as errors

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>