mtd: rawnand: omap_gpmc: Optimize NAND reads

Rename omap_nand_read() to omap_nand_read_buf() to reflect
actual behaviour.

Use FIFO read address instead of raw read address for reads.

The GPMC automatically converts 32-bit/16-bit reads to NAND
device specific reads (8/16 bit). Use the largest possible
read granularity size for more efficient reads.

Signed-off-by: Roger Quadros <[email protected]>
Reviewed-by: Michael Trimarchi <[email protected]>
Link: https://lore.kernel.org/all/[email protected]
Signed-off-by: Dario Binacchi <[email protected]>

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