RE: [RFC V2] arm/arm64:add CONFIG_HAVE_ARCH_BITREVERSE to support rbit instruction

[Wang, Yalin]

> 
> If this is done, the direct uses of byte_rev_table in
> drivers/net/wireless/ath/carl9170/phy.c and sound/usb/6fire/firmware.c
> should be converted too?
> 

I think use bitrev8()  is safer than to use byte_rev_table[]  directly.

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