Add a coreboot enabled config file for SeaBIOS and use it in defconfig

Right now SeaBIOS defaults to some wrong options during our build. This
adds a default config file that can hold our configuration.

BUG=none
TEST=check .config file after building, should contain CONFIG_COREBOOT=y

Change-Id: I2595346c9a887a0f5194f9ccf66eb7c9b2e4b008
2 files changed