mb/google/skyrim: Enable STB Spill-to-DRAM by default

BUG=b:231291430
TEST=See STB Spill-to-DRAM enabled

Signed-off-by: Martin Roth <gaumless@gmail.com>
Change-Id: Ib60b7fc2ba85c7a8025c9f8c6495e94049499f56
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69707
Reviewed-by: Jon Murphy <jpmurphy@google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/skyrim/Kconfig

@@ -147,4 +147,11 @@ config CONSOLE_CBMEM_BUFFER_SIZE
 	hex
 	default 0x80000
 
+config ENABLE_STB_SPILL_TO_DRAM
+	default y
+	help
+	  Spill-to-DRAM is an STB feature that extends the buffer from using
+	  just the small SRAM buffer to a much larger area reserved in main
+	  memory.
+
 endif # BOARD_GOOGLE_BASEBOARD_SKYRIM