soc/intel/skylake: Bump up bootblock size to 48K

When UART_DEBUG is enabled bootblock size grows more than the current
32K. Bump this up to 48K.

Change-Id: I580137dfdc9b4ad226c866f2b23b159bd820c62c
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/16317
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/src/soc/intel/skylake/Kconfig b/src/soc/intel/skylake/Kconfig
index 3bf8798..6171c41 100644
--- a/src/soc/intel/skylake/Kconfig
+++ b/src/soc/intel/skylake/Kconfig
@@ -101,7 +101,7 @@
 
 config C_ENV_BOOTBLOCK_SIZE
 	hex
-	default 0x8000
+	default 0xC000
 
 config EXCLUDE_NATIVE_SD_INTERFACE
 	bool