remove LGE_REV_G from board_lge.h

Change-Id: Ie39bc79163c46f0bec440409ccef6181583c4442
Revert "remove LGE_REV_G from board_lge.h"

This reverts commit db09e93bb723c0550a5847ca20d3b12925f4ede6

Change-Id: I5eb9af30778ab0825c59811896ffe17a34998193