Revert "serial: Airoha SoC UART and HSUART support"

This reverts commit e12ebf14.

It causes build errors in linux-next.

Cc: Benjamin Larsson <benjamin.larsson@genexis.eu>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Link: https://lore.kernel.org/r/20250206135328.4bad1401@canb.auug.org.au


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>