kernel: ltq-adsl: fix compilation warning on 6.6

kernel: ltq-adsl: fix compilation warning on 6.6

Fix compilation warning:
./include/linux/export.h:29:22: error: passing argument 1 of 'class_create' from incompatible pointer type [-Werror=incompatible-pointer-types]
   29 | #define THIS_MODULE (&__this_module)
      |                     ~^~~~~~~~~~~~~~~
      |                      |
      |                      struct module *
/home/aleksander/workspace/openwrt/build_dir/target-mips_24kc_musl/linux-lantiq_xway/ltq-dsl-ar9/drv_dsl_cpe_api-3.24.4.4/src/common/drv_dsl_cpe_os_linux.c:1105:29: note: in expansion of macro 'THIS_MODULE'
 1105 |    dsl_class = class_create(THIS_MODULE, "dsl_cpe_api");
      |                             ^~~~~~~~~~~
In file included from ./include/linux/device.h:31,
                 from ./include/linux/platform_device.h:13,
                 from ./include/linux/of_device.h:5,
                 from ./include/linux/of_platform.h:10,
                 from /home/aleksander/workspace/openwrt/build_dir/target-mips_24kc_musl/linux-lantiq_xway/ltq-dsl-ar9/drv_dsl_cpe_api-3.24.4.4/src/common/drv_dsl_cpe_os_linux.c:15:
./include/linux/device/class.h:230:54: note: expected 'const char *' but argument is of type 'struct module *'
  230 | struct class * __must_check class_create(const char *name);
      |                                          ~~~~~~~~~~~~^~~~
/home/aleksander/workspace/openwrt/build_dir/target-mips_24kc_musl/linux-lantiq_xway/ltq-dsl-ar9/drv_dsl_cpe_api-3.24.4.4/src/common/drv_dsl_cpe_os_linux.c:1105:16: error: too many arguments to function 'class_>
 1105 |    dsl_class = class_create(THIS_MODULE, "dsl_cpe_api");
      |                ^~~~~~~~~~~~
./include/linux/device/class.h:230:29: note: declared here
  230 | struct class * __must_check class_create(const char *name);
      |                             ^~~~~~~~~~~~
cc1: all warnings being treated as errors

Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>