Platform: Add break for switch cases

The function tfm_hal_memory_has_access directly return
TFM_HAL_ERROR_INVALID_INPUT without break, add them.

Change-Id: I285388e85ae7d07b0c82a4c33618790c2d085d19
Signed-off-by: Shawn Shan <Shawn.Shan@arm.com>
diff --git a/platform/ext/common/tfm_hal_isolation_mpu_v8m.c b/platform/ext/common/tfm_hal_isolation_mpu_v8m.c
index 1511536..a2cef19 100644
--- a/platform/ext/common/tfm_hal_isolation_mpu_v8m.c
+++ b/platform/ext/common/tfm_hal_isolation_mpu_v8m.c
@@ -137,8 +137,10 @@
     switch (attr & TFM_HAL_ACCESS_PRIVILEGE_MSK) {
     case TFM_HAL_ACCESS_PRIVILEGED:
         privilege_mode = TFM_PARTITION_PRIVILEGED_MODE;
+        break;
     case TFM_HAL_ACCESS_UNPRIVILEGED:
         privilege_mode = TFM_PARTITION_UNPRIVILEGED_MODE;
+        break;
     default:
         return TFM_HAL_ERROR_INVALID_INPUT;
     }