msm: peripheral_loader: Use the new request_firmware_direct API

The request_firmware_direct API is more suited to devices
with memory constraints. Replace the call to request_firmware
with this new API.

Change-Id: I7e23c7b1f0728126b2b285addf81beee4d80a2b0
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>