add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/arch/m68k/include/asm/io_mm.h
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..
@@ -381,8 +381,6 @@
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 #define writesw(port, buf, nr)    raw_outsw((port), (u16 *)(buf), (nr))
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 #define writesl(port, buf, nr)    raw_outsl((port), (u32 *)(buf), (nr))
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-#define mmiowb()
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-
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 #ifndef CONFIG_SUN3
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 #define IO_SPACE_LIMIT 0xffff
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 #else