bootconfig: Allow empty bootconfig.

Boot device and boot slot might be modified even
if Android does not set up default value. This
patch allow to setup this values, when initial
bootconfig was empty.

BUG=b:326365111
TEST=Build FW for brya and boot android
BRANCH=firmware-android-15949.B

Change-Id: Ifbcfb37e3e2f4e00aaee25dc8509858ea989329f
Signed-off-by: Grzegorz Bernacki <bernacki@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/depthcharge/+/5729852
Reviewed-by: Jakub Czapiga <czapiga@google.com>
2 files changed