ARM: qcom: Fix SCM interface for big-endian kernels

The secure environment only runs in little-endian mode, so any
buffers shared with the secure environment should have their
contents converted to little-endian. We also mark such elements
with __le32 to allow sparse to catch such problems.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Kumar Gala <galak@codeaurora.org>