mtd: nand: pxa3xx_nand: fix early spurious interrupt

When the nand is first probe, and upon the first command start, the
status bits should be cleared before the interrupts are unmasked.

This commit is taken from Linux:
'commit 0b14392db2e'
("mtd: nand: pxa3xx_nand: fix early spurious interrupt")
Signed-off-by: NChris Packham <judge.packham@gmail.com>
Signed-off-by: NOfer Heifetz <oferh@marvell.com>
Reviewed-by: NIgal Liberman <igall@marvell.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: NStefan Roese <sr@denx.de>

drivers/mtd/nand/pxa3xx_nand.c

@@ -481,8 +481,8 @@ static void pxa3xx_nand_start(struct pxa3xx_nand_info *info)
 	ndcr |= NDCR_ND_RUN;
 
 	/* clear status bits and run */
-	nand_writel(info, NDCR, 0);
 	nand_writel(info, NDSR, NDSR_MASK);
+	nand_writel(info, NDCR, 0);
 	nand_writel(info, NDCR, ndcr);
 }