SIO: condition compile Nuvoton WPCM450 early_init.c

Compile Nuvoton WPCM450 early_init.c when CONFIG_SUPERIO_NUVOTON_WPCM450

Change-Id: Ie31b8ae6aa45d6f77efa2b61e215ba0987abf878
Signed-off-by: Kerry Sheh <kerry.she@amd.com>
Signed-off-by: Kerry Sheh <shekairui@gmail.com>
Reviewed-on: http://review.coreboot.org/566
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
1 file changed