uboot-rockchip: add FriendlyElec NanoPi R6C

uboot-rockchip: add FriendlyElec NanoPi R6C

1- The NanoPi R6C is a SBC by FriendlyElec based on the Rockchip RK3588s.
   It comes with 4GB or 8GB of RAM, a microSD card slot, optional 32GB eMMC
   storage, one M.2 M-Key connector, one RTL8211F 1GbE and one RTL8125
   2.5GbE Ethernet port, one USB 2.0 Type-A and one USB 3.0 Type-A port, a
   HDMI port, a 30-pin GPIO header as well as multiple buttons and LEDs.
2- Renamed 000-backport-upstream-dts-sync.patch -> 000-v2024.10-rc1-backport-upstream-dts-sync.patch
   to add the version when was applied upstream

Signed-off-by: Antonio Flores <antflores627@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/16275
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>