fix(nxp-mmc): remove unnecessary delay

There are no references in the reference manual indicating a required
delay after resetting INTSIGEN. Therefore, it is safe to remove this
step.

Change-Id: Ia748cfeb8f4a0f619480ef59451df90f85f69fa8
Signed-off-by: Ghennadi Procopciuc <ghennadi.procopciuc@nxp.com>
diff --git a/drivers/imx/usdhc/imx_usdhc.c b/drivers/imx/usdhc/imx_usdhc.c
index 7b5c072..037de05 100644
--- a/drivers/imx/usdhc/imx_usdhc.c
+++ b/drivers/imx/usdhc/imx_usdhc.c
@@ -266,7 +266,6 @@
 		;
 
 	mmio_write_32(reg_base + INTSIGEN, 0);
-	udelay(1000);
 
 	if (data) {
 		mixctl |= MIXCTRL_DMAEN;