ARC: Add read*_relaxed to asm/io.h
ARC: Add read*_relaxed to asm/io.h

Some drivers require these, and ARC didn't had them yet.

Signed-off-by: Mischa Jonker <17dd7bf52eefcca323aba1679f480e7f18d70ddd@synopsys.com>
Signed-off-by: Vineet Gupta <af669d95a4c0de051445d4cafdbb2c5c4a2838be@synopsys.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs