Add entry point stubs of each stage for Brya. More functionalities will
be added later.
BUG=b:174266035
TEST=Build Test
Signed-off-by: Eric Lai <ericr_lai@compal.corp-partner.google.com>
Change-Id: I44934c05ee32090b6e34648ee02f004c83e93d57
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48063
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
50886827b5