msm: camera: isp: Add support for initial frame drop

Initial frame drop is required for some sensors. User space
provide the number of  frames need to drop through blob
command buffer.
If initial frame drop is provided, CSID driver enable the SOF irq
at csid path start. For every SOF IRQ, count will be incremented
and if it reaches the init frame drop number then configure path
control registers to start the path at frame boundary.

For dual ife usecase, first RDI frame need to drop as pix frame
will be dropped for csid synchronization.

Change-Id: I615c9f03a7387329214fa6d2fc12e8578a665593
Signed-off-by: Ravikishore Pampana <rpampana@codeaurora.org>