soc: qcom: spss_utils: call IAR callbacks from ioctl

Now that spss is brought up by UEFI and not by HLOS,
the IAR callback is not called on power up.
Call the iar callback functions from ioctl,
to read the spu pbl fw cmac from shared memory.
The PIL should still call the IAR callback on spss SSR.
Remove the call to hyp-assign as this is done by UEFI.

Change-Id: I78dde36dcdc3ae310930c6901bf367c2df789a25
Signed-off-by: Amir Samuelov <amirs@codeaurora.org>