Convert CONFIG_SYS_I2C_MXC et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_I2C_MXC
   CONFIG_SYS_I2C_MXC_I2C1
   CONFIG_SYS_I2C_MXC_I2C2
   CONFIG_SYS_I2C_MXC_I2C3
   CONFIG_SYS_I2C_MXC_I2C4

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/ls1046aqds_qspi_defconfig b/configs/ls1046aqds_qspi_defconfig
index 1b06cc6..e597ca6 100644
--- a/configs/ls1046aqds_qspi_defconfig
+++ b/configs/ls1046aqds_qspi_defconfig
@@ -7,6 +7,10 @@
 CONFIG_ENV_SIZE=0x2000
 CONFIG_ENV_OFFSET=0x300000
 CONFIG_ENV_SECT_SIZE=0x10000
+CONFIG_SYS_I2C_MXC_I2C1=y
+CONFIG_SYS_I2C_MXC_I2C2=y
+CONFIG_SYS_I2C_MXC_I2C3=y
+CONFIG_SYS_I2C_MXC_I2C4=y
 CONFIG_DM_GPIO=y
 CONFIG_DEFAULT_DEVICE_TREE="fsl-ls1046a-qds-duart"
 CONFIG_FSL_USE_PCA9547_MUX=y