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: Ib976d8227e605b9aad8191c6fe8f1dcc5d28e90e
Signed-off-by: Mona Hossain <mhossain@codeaurora.org>