msm: camera: isp: Set device enable flag after enable csid hardware

Device enable flag is getting set after configuring the CSID csi rx
and csid path configuration. If irq comes after configuring the csi rx
hardware then irq handler is not handling as it is checking the device
enable flag. So set device enable flag after enabling the hardware.

CRs-Fixed: 2541840
Change-Id: I022b6dccef4153c34bc8cf99e7a18e2978f92d3f
Signed-off-by: Ravikishore Pampana <rpampana@codeaurora.org>