feat(drtm): flush dcache before DLME launch

Flush the data cache range before DLME launch to ensure that data
passed by DCE preamble is committed.

Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
Change-Id: I9946fd3420a17b86d9f1483e8b2cd5880033454e
1 file changed