Add conditional on TARGET_BOARD_PLATFORM_VARIANT

Only build if TARGET_BOARD_PLATFORM_VARIANT is not set.
Boards (like phantasm) will set TARGET_BOARD_PLATFORM_VARIANT
when they want to use a different set of hardware files
(like hardware/ti/omap4-aah) and not the ones in this project.

Change-Id: I2cd921a97ae66b08494c65e038022fa3c739de72
Signed-off-by: Mike J. Chen <mjchen@google.com>
1 file changed