UPSTREAM: soc/intel/quark: Add missing breaks

Add missing breaks in reg_access.c.

TEST=Build and run on Galileo Gen2

Found-by: Converity Scan #1361261

BUG=None
BRANCH=None

Change-Id: I04b2b635c4d61c192b0851cf5b3cae2f61538b36
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/16069
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-on: https://chromium-review.googlesource.com/368710
Commit-Ready: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/quark/reg_access.c

@@ -163,9 +163,11 @@ static void reg_cpu_cr_write(uint32_t reg_address, CRx_TYPE value)
 
 	case 0:
 		write_cr0(value);
+		break;
 
 	case 4:
 		write_cr4(value);
+		break;
 	}
 }