linux-imx

powerpc/64s: Add exception macro that does not enable RI

Subsequent patches will add more non-RI variant exceptions, so
create a macro for it rather than open-code it.

This does not change generated instructions.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>