lib: add bitrev8x4()
Add a function to reverse bytes within a 32 bit word. Operate on a u32 rather than individual bytes. Signed-off-by: NJoshua Clayton <stillcompiling@gmail.com> Signed-off-by: NAlan Tull <atull@kernel.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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