soc/intel/common/uart: Restrict scope of uart_common_init to uart.c
uart_common_init is not used outside of
soc/intel/common/block/uart.c. This change restricts the scope to this
file and drops the declaration from uart.h
Change-Id: I499a53506f9b2e91ecc7334bf9b023d342e802fc
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49211
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>