ion: Fix ion compilation errors on Kona

Include the following changes missed out during the merge
from msm-4.14 to msm-kona to overcome compilation issues in Kona:

1.a1bc21a0
(ion: Fix missing mutex_unlock on error path)

2.Address the prototype change of function of_dma_configure()

Change-Id: I7505da3ff77a1fed9a51708e54fa179ee1fb4636
Signed-off-by: Swathi Sridhar <swatsrid@codeaurora.org>