mtd: mxc_nand: use __iowrite32_copy for 32 bit copy
mtd: mxc_nand: use __iowrite32_copy for 32 bit copy

The driver was also using own method to do 32bit copy, turns out
we have a kernel API so use that instead

Signed-off-by: Vinod Koul <5cf69c63beb17bf38d63aa0e923ee8256af0e205@intel.com>
Signed-off-by: Brian Norris <ac73eed4b8a8c9127255a2696c52b2e7503720b8@gmail.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs