Apparently nobody seems to have tested clang 13 before release, as the whole
coding paradigm of calling a function by assigning its return value to a
variable, which is used all throughout the Linux kernel, becomes broken,
as clang seems utterly drunk when it comes to the actual judgement whether
the variable is really used or not..

Allows a defconfig to set a list of dtbs to concatenate with an
Image.gz to create a Image.gz-dtb.

Includes 8adb162 arm64: Fix correct dtb clean-files location

Change-Id: I0b462322d5c970f1fdf37baffece7ad058099f4a
Signed-off-by: Alex Ray <aray@google.com>
[rishabhb] Use subdir to descend into device tree directories
Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>

konrad: fast-forward it to msm-5.4