Initial support for Broadcom VideoCore / BCM21553

This commit adds Broadcom support for:
* frameworks/native

Enable via:
* BOARD_USES_BROADCOM_HARDWARE := true
* COMMON_GLOBAL_CFLAGS += -DBCM_HARDWARE

Change-Id: Iba16d9c504a386f8a47c8b33962b7c079f380bd5