add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/tools/testing/selftests/powerpc/primitives/Makefile
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..
@@ -1,3 +1,4 @@
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+# SPDX-License-Identifier: GPL-2.0-only
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 CFLAGS += -I$(CURDIR)
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 TEST_GEN_PROGS := load_unaligned_zeropad