cdns_i2c: Handle data transfers exceeding FIFO depth

Changes to enhance/improve cdns_i2c driver polling-based
routines:

1. Provide FIFO depth and maximum transfer size as module
   config parameters as they are configurable in the RTL.

2. I2C transfers exceeding FIFO depth would silently fail.
   Add handling to send and receive data sizes requested by the
   caller module. This leverages Cadence I2C FIFO depth and the
   Transfer Size Register (TSR) parameters, which are both
   configured in the RTL.

3. Add handling for transferring data sizes exceeding the
   maximum transfer size (given by TSR).

4. As an extension to point 3 above, add a workaround to
   continue with the data transfer in 'I2C Receiver' mode when
   the TSR counter reaches 0. This is a limitation with the IP
   (possibly a bug), where the I2C transfer terminates upon TSR
   reaching 0 even when the HOLD bit is set. The workaround handles
   this by ensuring that TSR doesn't drop to 0 until the last byte
   of data has been received.

Signed-off-by: Anurag Koul <anurag.koul@arm.com>
Change-Id: I1849b6c41ecfe79228d3123716003cf1faef1de3