scripts/Makefile.lib: Only apply u-boot.dtsi files in the target directory
We only want to apply files such as 'omap5-u-boot.dtsi', which resides
in arch/arm/dts/ to other files in arch/arm/dts/ and not say
test/overlay/. Rework the make logic to check for -u-boot.dtsi files in
the same directory as their target dts.
Cc: Simon Glass <[email protected]>
Reported-by: Pantelis Antoniou <[email protected]>
Signed-off-by: Tom Rini <[email protected]>
Tested-by: Pantelis Antoniou <[email protected]>
Reviewed-by: Simon Glass <[email protected]>