powerpc: pcibios_enable_device_hook: return bool rather than int

pcibios_enable_device_hook returned an int. Every implementation
returned either -EINVAL or 0. The return value wasn't propagated by
the caller: any non-zero return value caused pcibios_enable_device
to return -EINVAL itself. Therefore, make the hook return a bool.

Signed-off-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --cc arch/powerpc/include/asm/machdep.h
Simple merge

diff --cc arch/powerpc/kernel/pci-common.c
Simple merge

diff --cc arch/powerpc/platforms/powermac/pci.c
Simple merge

diff --cc arch/powerpc/platforms/powermac/pmac.h
Simple merge

diff --cc arch/powerpc/platforms/powernv/pci-ioda.c
Simple merge