As we reset the GPMI block at resume, the timing parameters setup by a
previous exec_op is lost.  Rewriting GPMI timing registers on first exec_op
after resume fixes the problem.

Fixes: ef347c0c ("mtd: rawnand: gpmi: Implement exec_op")
Cc: stable@vger.kernel.org
Signed-off-by: NEsben Haabendal <esben@geanix.com>
Acked-by: NHan Xu <han.xu@nxp.com>
Signed-off-by: NMiquel Raynal <miquel.raynal@bootlin.com>