add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/arch/xtensa/platforms/xt2000/Makefile
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..
@@ -1,3 +1,4 @@
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+# SPDX-License-Identifier: GPL-2.0-only
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 #
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 # Makefile for the Tensilica XT2000 Emulation Board
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 #