soc/amd/sabrina/psp_verstage: Implement get_uart_base

The Sabrina PSP doesn't support mapping the UART, so add a dummy
function to return NULL.

BUG=b:215599230
TEST=None

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: Idad8e4874e78bb96730feecb5a7b17334d12217c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61609
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>

0 files changed, 0 insertions, 0 deletions