nb/intel/sandybridge: Retype constant

There's no need to use size_t to store a boolean.

Change-Id: I0069fa8d75583dc34b402004d753220943406a04
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47487
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
diff --git a/src/northbridge/intel/sandybridge/raminit_common.c b/src/northbridge/intel/sandybridge/raminit_common.c
index 3fd8cb0..e23753a 100644
--- a/src/northbridge/intel/sandybridge/raminit_common.c
+++ b/src/northbridge/intel/sandybridge/raminit_common.c
@@ -4433,7 +4433,7 @@
 /* FIXME: values in this function should be hardware revision-dependent */
 void final_registers(ramctr_timing *ctrl)
 {
-	const size_t is_mobile = get_platform_type() == PLATFORM_MOBILE;
+	const bool is_mobile = get_platform_type() == PLATFORM_MOBILE;
 
 	int channel;
 	int t1_cycles = 0, t1_ns = 0, t2_ns;