accel/qaic: Add MHI controller

An AIC100 device contains a MHI interface with a number of different
channels for controlling different aspects of the device. The MHI
controller works with the MHI bus to enable and drive that interface.

AIC100 uses the BHI protocol in PBL to load SBL. The MHI controller
expects the SBL to be located at /lib/firmware/qcom/aic100/sbl.bin and
expects the MHI bus to manage the process of loading and sending SBL to
the device.

Signed-off-by: Jeffrey Hugo <[email protected]>
Reviewed-by: Carl Vanderlip <[email protected]>
Reviewed-by: Pranjal Ramajor Asha Kanojiya <[email protected]>
Reviewed-by: Stanislaw Gruszka <[email protected]>
Reviewed-by: Jacek Lawrynowicz <[email protected]>
Acked-by: Oded Gabbay <[email protected]>
Signed-off-by: Jacek Lawrynowicz <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: quic-jhugo