nb/intel/x4x: Change signature of decode_pciebar

Rename it and make it return an int, like other northbridges do.

Change-Id: I8bbf28350976547c83e039731d316e0911197d54
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44141
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/northbridge/intel/x4x/memmap.c

@@ -57,7 +57,7 @@ u32 decode_tseg_size(const u32 esmramc)
 	}
 }
 
-u8 decode_pciebar(u32 *const base, u32 *const len)
+int decode_pcie_bar(u32 *const base, u32 *const len)
 {
 	*base = 0;
 	*len = 0;