cpu/intel/slot_1: Select 16KiB bootblock if console is enabled

We previously confirmed [1] that bootblock will grow beyond current
8KiB size if console is enabled. Automatically change to 16KiB if user
enabled it in menuconfig.

[1] https://review.coreboot.org/c/coreboot/+/36775

Change-Id: Ic9988c77cf9677167a382aa4dc7dcfa2bc4cbe02
Signed-off-by: Keith Hui <buurin@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41460
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/cpu/intel/slot_1/Kconfig

@@ -32,6 +32,7 @@ config DCACHE_BSP_STACK_SIZE
 
 config C_ENV_BOOTBLOCK_SIZE
 	hex
+	default 0x4000 if BOOTBLOCK_CONSOLE
 	default 0x2000
 
 endif