src/cpu: Capitalize CPU

Change-Id: I58d5c16de796a91fa14d8db78722024266c09a94
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/15934
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>

src/cpu/intel/model_f4x/model_f4x_init.c

@@ -36,10 +36,10 @@ static void model_f4x_init(struct device *cpu)
 		intel_update_microcode_from_cbfs();
 	}
 
-	/* Enable the local cpu apics */
+	/* Enable the local CPU apics */
 	setup_lapic();
 
-	/* Start up my cpu siblings */
+	/* Start up my CPU siblings */
 	intel_sibling_init(cpu);
 };