imx6: geam6ul: Add I2C support

Add I2C support for Engicam GEAM6UL module.

geam6ul> i2c bus
Bus 0:  i2c@021a0000
Bus 1:  i2c@021a4000
geam6ul> i2c dev 0
Setting bus to 0
geam6ul> i2c dev
Current bus is 0
geam6ul> i2c speed 100000
Setting bus speed to 100000 Hz
geam6ul> i2c probe
Valid chip addresses: 2C
geam6ul> i2c md 2C 0xff
00ff: 00 00 00 00 0f f0 01 64 ff ff 00 00 00 00 00 00    .......d........

Cc: Stefano Babic <sbabic@denx.de>
Cc: Matteo Lisi <matteo.lisi@engicam.com>
Cc: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: NJagan Teki <jagan@amarulasolutions.com>

arch/arm/cpu/armv7/mx6/Kconfig

@@ -187,6 +187,7 @@ config TARGET_MX6UL_GEAM
 	select OF_CONTROL
 	select DM
 	select DM_GPIO
+	select DM_I2C
 	select DM_MMC
 	select DM_THERMAL
 	select SUPPORT_SPL

configs/imx6ul_geam_mmc_defconfig

@@ -25,11 +25,13 @@ CONFIG_CMD_EXT4=y
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
+CONFIG_CMD_I2C=y
 CONFIG_OF_LIBFDT=y
 CONFIG_MXC_UART=y
 CONFIG_IMX_THERMAL=y
 CONFIG_PINCTRL=y
 CONFIG_PINCTRL_IMX6=y
+CONFIG_SYS_I2C_MXC=y
 CONFIG_SPL_LIBDISK_SUPPORT=y
 CONFIG_SPL_LIBCOMMON_SUPPORT=y
 CONFIG_SPL_LIBGENERIC_SUPPORT=y