OMAPDSS: DISPC: Read fifo size of Writeback pipeline

The Writeback pipeline is a block in OMAP4's Display controller which can take
input from a pipeline or an overlay manager and feed it back to memory. Hence,
it allows to take benefit of the hardware processing available inside
the DISPC like color space conversion, rescaling, compositing to perform
memory-to-memory transfer with data processing or capturing a displayed frame.

The Writeback pipeline has it's own FIFO like the other pipelines. Since
Writeback isn't supported in OMAPDSS yet, we can use it's FIFO for some other
pipe which needs it. OMAP4 DISPC has a mechanism to share FIFOs among pipes
which makes this possible.

Add writeback pipeline as a member of omap_plane struct, add register offsets
for it's FIFO_SIZE_STATUS register so that the DISPC driver is aware of it's
fifo size. This would be used later to transfer the FIFO to another pipe, and
have a larger FIFO during fifomerge.

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