soc/intel/baytrail: Make `num_cpus` unsigned

Change-Id: I9ab0106c27a834d5d2ac1cb8023f4400a8ad91cd
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58916
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/soc/intel/baytrail/include/soc/pattrs.h

@@ -29,7 +29,7 @@ struct pattrs {
 	int stepping;
 	const void *microcode_patch;
 	int address_bits;
-	int num_cpus;
+	unsigned int num_cpus;
 	unsigned int bclk_khz;
 };