device/Kconfig: Declare MMCONF symbols' type once

Only specify the type of MMCONF_BASE_ADDRESS and MMCONF_BUS_NUMBER once.

Change-Id: Iacd2ed0dae5f1fb6b309124da53b3fa0eef32693
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50032
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/baytrail/Kconfig

@@ -42,7 +42,6 @@ config VBOOT
 	select VBOOT_STARTS_IN_ROMSTAGE
 
 config MMCONF_BASE_ADDRESS
-	hex
 	default 0xe0000000
 
 config MAX_CPUS