PSCI: Add initial support for PSCIv0.2 functions

The PSCIv0.2 spec defines standard values of function IDs
and introduces a few new functions. Detect version of PSCI
and appropriately select the right PSCI functions.

Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>

diff --cc arch/arm/include/asm/psci.h
Simple merge

diff --cc arch/arm/kernel/psci.c
Simple merge

diff --cc arch/arm64/include/asm/psci.h
Simple merge

diff --cc arch/arm64/kernel/psci.c
Simple merge