configs: nitrogen6x: Add DM_MMC/DM_USB/AHCI support

Add DM_MMC to all defconfigs whose board is
nitrogen6x.

mx6qsabrelite_defconfig
nitrogen6dl2g_defconfig
nitrogen6dl_defconfig
nitrogen6q2g_defconfig
nitrogen6q_defconfig
nitrogen6s1g_defconfig

This commit is adding multiple configs, but
seems to be the minimum change to not lose features
and still compile fine.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
diff --git a/configs/nitrogen6dl2g_defconfig b/configs/nitrogen6dl2g_defconfig
index 015336f..b1df37f 100644
--- a/configs/nitrogen6dl2g_defconfig
+++ b/configs/nitrogen6dl2g_defconfig
@@ -4,6 +4,8 @@
 CONFIG_TARGET_NITROGEN6X=y
 CONFIG_NR_DRAM_BANKS=1
 CONFIG_CMD_HDMIDETECT=y
+CONFIG_AHCI=y
+# CONFIG_SYS_MALLOC_F is not set
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/boundary/nitrogen6x/nitrogen6dl2g.cfg,MX6DL,DDR_MB=2048"
 CONFIG_BOOTDELAY=3
 CONFIG_USE_PREBOOT=y
@@ -37,9 +39,11 @@
 CONFIG_OF_CONTROL=y
 CONFIG_DEFAULT_DEVICE_TREE="imx6dl-nitrogen6x"
 CONFIG_ENV_IS_IN_SPI_FLASH=y
+CONFIG_DM=y
 CONFIG_USB_FUNCTION_FASTBOOT=y
 CONFIG_FASTBOOT_BUF_ADDR=0x12000000
 CONFIG_FSL_USDHC=y
+CONFIG_DM_MMC=y
 CONFIG_SPI_FLASH=y
 CONFIG_SF_DEFAULT_MODE=0
 CONFIG_SF_DEFAULT_SPEED=25000000
@@ -51,6 +55,7 @@
 CONFIG_SPI=y
 CONFIG_MXC_SPI=y
 CONFIG_USB=y
+CONFIG_DM_USB=y
 CONFIG_USB_STORAGE=y
 CONFIG_USB_KEYBOARD=y
 CONFIG_SYS_USB_EVENT_POLL_VIA_CONTROL_EP=y