soc: qcom: spss_utils: add IAR support

Put the spss-firmware IAR-CMAC after firmware image.
Add ioctl support to set CMAC from spdaemon.
Add attr to get pbl_cmac_buf.

Change-Id: Iffb67fe6e68d83d2c406e0f8f5cf980195a44f5e
Signed-off-by: Amir Samuelov <amirs@codeaurora.org>
Signed-off-by: Nurit Lichtenstein <nuritl@codeaurora.org>