Add support for VARIANT_DEFCONFIG

Change-Id: I6eb3346ea9d8e0fac8b556682f051074c21cc8b0
Enable RTC on GSM builds

Change-Id: I81064ee5ddc54ff827e341160ad35444a0ebb1da
Add support for SELINUX_DEFCONFIG

Change-Id: Id26dfe346902b4a42dc0e9057035c5e6395b4328