[BSP][BOOTFILES] uart: add config to enable gpio uart on rpi5
Add configuration parameter that, for machine raspberrypi5, sets up serial port on GPIO 14/15.
This config only affects kernel and userspace, as U-boot does not have the necessary driver, and continues to use the primary uart.
This option is useful for Compute Module 5 which does not come with the primary UART header mounted.
Signed-off-by: default avatarAlessandro Pecugi alessandro.pecugi@seco.com