src/include: Fix unsigned warnings

Fix warning detected by checkpatch.pl:

WARNING: Prefer 'unsigned int' to bare use of 'unsigned'

BRANCH=none
BUG=None
TEST=Build and run on Galileo Gen2

Change-Id: I23d9b4b715aa74acc387db8fb8d3c73bd5cabfaa
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/18607
Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/include/cpu/x86/tsc.h b/src/include/cpu/x86/tsc.h
index e4ca0e7..5a7fbc2 100644
--- a/src/include/cpu/x86/tsc.h
+++ b/src/include/cpu/x86/tsc.h
@@ -12,8 +12,8 @@
 #endif
 
 struct tsc_struct {
-	unsigned lo;
-	unsigned hi;
+	unsigned int lo;
+	unsigned int hi;
 };
 typedef struct tsc_struct tsc_t;