In Makefiles if we're testing a CONFIG_FOO symbol for equality with 'y'
we can instead just use ifdef. The latter reads easily, so convert to
it where possible.
Signed-off-by: NRodrigo R. Galvao <rosattig@linux.vnet.ibm.com>
Reviewed-by: NMauro S. M. Rodrigues <maurosr@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>