ARC: make write_aux_reg safer against macro substitution
ARC: make write_aux_reg safer against macro substitution

It was generating warnings when called as write_aux_reg(x, paddr >> 32)

Signed-off-by: Vineet Gupta <af669d95a4c0de051445d4cafdbb2c5c4a2838be@synopsys.com>

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