* Linux: Update kernel 6.1.12
* Update generic_raw_uart to build with Linux 6.1
* Update Realtek rtl8821cu/rtl88x2bu to build with Linux 6.1
* Bump buildroot
* buildroot 43f82f01b9...90aa1a6daa (1):
> rtl8812au-aircrack-ng: bump to latest rev d98018
* Fix eq3_char_loop to build with Linux 6.1
* rtl8821cu: make sure -Werror is disabled for the kernel build
* generic_raw_uart: make sure -Werror is disabled for the kernel build
Add buildroot utils/check-package check to the pr-checks.yml workflow.
It checks for common errors/mistakes when creating own buildroot
packages. Also fixed all warnings this utility output for our existing packages.
* add eq3_char_loop package (eQ-3 char loopback kernel module)
* add generic_raw_uart package (low-latency raw UART kernel driver)
* add rpi-rf-mod package
* add device tree overlay support for RPI-RF-MOD/HM-MOD-RPI-PCB on Raspberry Pi
* enable GPIOLIB and GPIO_SYSFS required for RPI-RF-MOD/HM-MOD-RPI-PCB support.
* add basic RPI-RF-MOD/HM-MOD-RPI-PCB support for ASUS Tinker Board
* add device tree overlay support for ASUS Tinker Board and add
haos-config.txt loading support to U-Boot boot script
