Tegra186: Support AARCH32/64 encoding for MCE calls

On Tegra systems, there are multiple software components that
require to interact with MCE. The components can either be 32-bit
or 64-bit payloads. This patch supports MCE SMC functions ID for
AARCH32 and AARCH64 architectures to support such clients.

Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>