msm: ipa: fix to unlock the DDR region after FW loading

Changes to unlock the DDR region at the end of FW pil
loading.

Change-Id: I6f64f3d19efc1a52b7013fc15db67e70b9ac559c
Acked-by: Jyothi Jayanthi <jyothij@qti.qualcomm.com>
Signed-off-by: Michael Adisumarta <madisuma@codeaurora.org>