intel/socket_441: Increase bootblock size

One mainboard using this socket has less than 20 bytes of space left in
its bootblock, hindering development. Double the bootblock size to solve
the problem.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I620c13eab53c3326a4f4660b63ed1dd0fc81f563
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47585
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/cpu/intel/socket_441/Kconfig

@@ -12,7 +12,7 @@ config SOCKET_SPECIFIC_OPTIONS # dummy
 
 config C_ENV_BOOTBLOCK_SIZE
 	hex
-	default 0x4000
+	default 0x8000
 
 config DCACHE_RAM_BASE
 	hex