add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/arch/powerpc/include/asm/imc-pmu.h
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..
@@ -137,7 +137,7 @@
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  * are inited.
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  */
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 struct imc_pmu_ref {
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-	struct mutex lock;
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+	spinlock_t lock;
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 	unsigned int id;
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 	int refc;
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 };