mhi: cntrl: qcom: Add EDL image to the firmware table

Some devices support Emergency Download Mode or EDL and could
enter EDL which requires host firmware load path to push the
EDL image to the device. Allow this for tests and debug mode
on all devices except sdx50m as there is no expected use case
for it.

Change-Id: I662520a11f04fa5cf4080e73947389a7e07db83b
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>