qseecom: Vote for CE clk before loading image

Add support for setting the Crypto HW to operate in
high bandwidth mode before issuing a request to load
image.

This is needed for better performance when using crypto
HW to authenticate the image before loading it.

Change-Id: I42d40554ad2d64551db222ea7255bc904b9af256
Signed-off-by: Mona Hossain <mhossain@codeaurora.org>