soc/intel/common/uart: Correctly guard uart_platform_base()

We should only provide this implementation when the Intel LPSS UART is
used. Otherwise, no other UART could be used for the console with these
SoCs.

Change-Id: Iebd89edb3f21d4a68587fd02659b4d529f3f4bbe
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33097
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lance Zhao <lance.zhao@gmail.com>

src/soc/intel/common/block/uart/uart.c

@@ -43,7 +43,7 @@ static void uart_lpss_init(uintptr_t baseaddr)
 			CONFIG_SOC_INTEL_COMMON_LPSS_UART_CLK_N_VAL);
 }
 
-#if CONFIG(DRIVERS_UART_8250MEM)
+#if CONFIG(INTEL_LPSS_UART_FOR_CONSOLE)
 uintptr_t uart_platform_base(int idx)
 {
 	if (idx == CONFIG_UART_FOR_CONSOLE)