powerpc: Reduce log level of "OPAL detected !" message

This message isn't terribly useful.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Benjamin Herrenschmidt 2017-11-22 17:01:06 +11:00 • committed by Michael Ellerman
commit 5138b31422