nb/intel/sandybridge: Drop casts from DEFAULT_{MCHBAR,DMIBAR}

This allows us to drop some casts to uintptr_t around the tree.
The MCHBAR32 macro still needs a cast to preserve reproducibility.
Only the native raminit path needs the cast, the MRC path does not.

Tested with BUILD_TIMELESS=1, these boards remain identical:
 - Lenovo ThinkPad X230
 - Dell OptiPlex 9010
 - Roda RW11 (with MRC raminit)

Change-Id: I8ca1c35e2c1f1b4f0d83bd7bb080b8667dbe3cb3
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45349
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/samsung/stumpy/early_init.c

@@ -101,8 +101,8 @@ void mainboard_fill_pei_data(struct pei_data *pei_data)
 {
 	struct pei_data pei_data_template = {
 		.pei_version = PEI_VERSION,
-		.mchbar = (uintptr_t)DEFAULT_MCHBAR,
-		.dmibar = (uintptr_t)DEFAULT_DMIBAR,
+		.mchbar = DEFAULT_MCHBAR,
+		.dmibar = DEFAULT_DMIBAR,
 		.epbar = DEFAULT_EPBAR,
 		.pciexbar = CONFIG_MMCONF_BASE_ADDRESS,
 		.smbusbar = CONFIG_FIXED_SMBUS_IO_BASE,