Revert "Implementation of Region API"

This reverts commit 1d3c804b6b.

This patch breaks cbuildbot on internal paladins bots.

Change-Id: Icf7f9d9bbb56b092035888eaa3e249ffd23fac16
(cherry picked from commit 3a60335ebb1530e5fd9d5da3bc6214949bc59caf)
Reviewed-on: https://chromium-review.googlesource.com/167451
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Yoshiki Iguchi <yoshiki@chromium.org>
Tested-by: Yoshiki Iguchi <yoshiki@chromium.org>

firmware/lib/include/vboot_display.h

@@ -42,6 +42,11 @@ void VbRenderTextAtPos(const char *text, int right_to_left,
  */
 const char *RecoveryReasonString(uint8_t code);
 
+/**
+ * Return a fixed string representing the HWID.
+ */
+const char *VbHWID(VbCommonParams *cparams);
+
 /**
  * Get the number of localizations in the GBB bitmap data.
  */