am33xx: Correct gpmc_cfg->irqstatus/enable

Based on our usage of the GPMC, either with NOR or NAND we do not need
to be setting the irqstatus or irqenable bits and should clear them like
we have historically.

Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/arch/arm/cpu/armv7/am33xx/mem.c b/arch/arm/cpu/armv7/am33xx/mem.c
index f81c9a8..03e8c66 100644
--- a/arch/arm/cpu/armv7/am33xx/mem.c
+++ b/arch/arm/cpu/armv7/am33xx/mem.c
@@ -69,8 +69,8 @@
 #endif
 	/* global settings */
 	writel(0x00000008, &gpmc_cfg->sysconfig);
-	writel(0x00000100, &gpmc_cfg->irqstatus);
-	writel(0x00000100, &gpmc_cfg->irqenable);
+	writel(0x00000000, &gpmc_cfg->irqstatus);
+	writel(0x00000000, &gpmc_cfg->irqenable);
 	writel(0x00000012, &gpmc_cfg->config);
 	/*
 	 * Disable the GPMC0 config set by ROM code