mtd: nand: omap: updated devm_xx for all resource allocation and free calls

"Managed Device Resource" or devm_xx calls takes care of automatic freeing
of the resource in case of:
- failure during driver probe
- failure during resource allocation
- detaching or unloading of driver module (rmmod)
Reference: Documentation/driver-model/devres.txt

Though OMAP NAND driver handles freeing of resource allocation in most of
the cases, but using devm_xx provides more clean and effortless approach
to handle all such cases.

- simplifies label for exiting probe during error
  s/out_release_mem_region/return_error

Signed-off-by: Pekon Gupta <pekon@ti.com>
Tested-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

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