commit ce88c9c7 upstream.

Add support for building DT overlays (%.dtbo). The overlay's source file
will have the usual extension, i.e. .dts, though the blob will have
.dtbo extension to distinguish it from normal blobs.

Acked-by: Masahiro Yamada <[email protected]>
Signed-off-by: Viresh Kumar <[email protected]>
Signed-off-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/434ba2467dd0cd011565625aeb3450650afe0aae.1611904394.git.viresh.kumar@linaro.org


[[email protected]: cherry-pick commit 'ce88c9c7' from v5.12]
Signed-off-by: Suman Anna <[email protected]>