FreeBSD/src 19048d5 (r340646)sys/dts Makefile.inc, sys/dts/arm Makefile.inc Makefile

MFC r340390: Fix test-dts{,o} targets

There were two main problems here:

1.) sys/dts/Makefile.inc is not included from various */overlays directories
    by default, only ../Makefile.inc
2.) When shelling out for DTS/DTSO, cwd != .CURDIR, so enumeration always
    failed

These changes allow make test-dts and make test-dtso to function in their
respective directories.
DeltaFile
+3-0sys/dts/arm64/Makefile.inc
+3-0sys/dts/arm/Makefile.inc
+1-1sys/dts/arm/overlays/Makefile
+1-1sys/dts/arm64/Makefile
+1-1sys/dts/arm64/overlays/Makefile
+1-1sys/dts/mips/Makefile
+1-1sys/dts/Makefile.inc
+1-1sys/dts/powerpc/Makefile
+1-1sys/dts/arm/Makefile
+13-79 files

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