msm: camera: sensor: Unmap DMA buffers to end access from kernel

Unmap DMA buffers in error/success cases to end the access from
kernel space.

CRs-Fixed: 3635168.

Change-Id: Ibbcffdfabfcc336cac8e29db8b1df50c7c34e601
Signed-off-by: Shadul Shaikh <quic_shaduls@quicinc.com>