powerpc: Use bool function return values of true/false not 1/0

Use the normal return values for bool functions

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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

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

diff --cc arch/powerpc/include/asm/kvm_book3s_64.h
Simple merge

diff --cc arch/powerpc/sysdev/dcr.c
Simple merge