i.MX6DL: mamoj: Add I2C support

i.MX6DL Mamoj has i2c3 and i2c4 buses, add support
through DM_I2C with dt definition.

i2c log:
Reviewed-by: Stefano Babic <sbabic@denx.de>

=======
=> i2c bus
Bus 2:  i2c@021a8000
Bus 3:  i2c@021f8000
=> i2c dev 2
Setting bus to 2
=> i2c speed 400000
Setting bus speed to 400000 Hz
=> i2c probe
Valid chip addresses: 20 51 53
=> i2c md 53 0xff
00ff: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff    ................
=> i2c md 51 0xff
00ff: a8 08 40 50 09 43 46 52 42 18 80 8e ae a9 d0 53    ..@P.CFRB......S
=> i2c dev 3
Setting bus to 3
=> i2c speed 100000
Setting bus speed to 100000 Hz
=> i2c probe
Valid chip addresses: 08 40 48 4B
=> i2c md 08 0xff
00ff: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Simone CIANNI <simone.cianni@bticino.it>
Signed-off-by: Raffaele RECALCATI <raffaele.recalcati@bticino.it>
diff --git a/configs/imx6dl_mamoj_defconfig b/configs/imx6dl_mamoj_defconfig
index e45ca9a..e2a18d2 100644
--- a/configs/imx6dl_mamoj_defconfig
+++ b/configs/imx6dl_mamoj_defconfig
@@ -12,6 +12,7 @@
 CONFIG_CRC32_VERIFY=y
 CONFIG_CMD_MEMTEST=y
 CONFIG_CMD_GPIO=y
+CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
@@ -37,3 +38,4 @@
 CONFIG_USB_GADGET_PRODUCT_NUM=0xa4a5
 CONFIG_CI_UDC=y
 CONFIG_IMX_THERMAL=y
+CONFIG_SYS_I2C_MXC=y