vendorcode/google/chromeos: Use unsigned int for "factory_config"

This patch ensures `chromeos_get_factory_config()` returns an
unsigned integer value because factory config represents
bit-fields to determine the Chromebook Plus branding.

Additionally, introduced safety measures to catch future
"factory_config" bit-field exhaustion.

BUG=b:317880956
TEST=Able to verify that google/screebo is branded as
Chromebook Plus.

Change-Id: I3021b8646de4750b4c8e2a2981f42500894fa2d0
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79769
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <ericllai@google.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>

0 files changed, 0 insertions, 0 deletions