configs/engicam_imx6qdl_icore_rqs: fix incorrect use of uboot defconfig file

In u-boot v2017.09 release, configs/imx6qdl_icore_rqs_mmc_defconfig
was renamed to configs/imx6qdl_icore_rqs_defconfig. So use correct
defconfig file name.

Signed-off-by: Shyam Saini <shyam.saini@amarulasolutions.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

configs/engicam_imx6qdl_icore_rqs_defconfig

@@ -15,7 +15,7 @@ BR2_TARGET_UBOOT=y
 BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
 BR2_TARGET_UBOOT_CUSTOM_VERSION=y
 BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2017.07-rc1"
-BR2_TARGET_UBOOT_BOARD_DEFCONFIG="imx6qdl_icore_rqs_mmc"
+BR2_TARGET_UBOOT_BOARD_DEFCONFIG="imx6qdl_icore_rqs"
 BR2_TARGET_UBOOT_NEEDS_DTC=y
 BR2_TARGET_UBOOT_NEEDS_OPENSSL=y
 BR2_TARGET_UBOOT_FORMAT_DTB_IMG=y