remoteproc: qcom: Introduce WCNSS peripheral image loader

This introduces the peripheral image loader, for loading WCNSS firmware
and boot the core on e.g. MSM8974. The firmware is verified and booted
with the help of the Peripheral Authentication System (PAS) in
TrustZone.

Tested-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>