Convert CONFIG_I2C_SET_DEFAULT_BUS_NUM et al to Kconfig

This converts the following to Kconfig:
   CONFIG_I2C_SET_DEFAULT_BUS_NUM
   CONFIG_I2C_DEFAULT_BUS_NUMBER

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/ls1012afrdm_qspi_defconfig b/configs/ls1012afrdm_qspi_defconfig
index 3844691..b8718b6 100644
--- a/configs/ls1012afrdm_qspi_defconfig
+++ b/configs/ls1012afrdm_qspi_defconfig
@@ -38,6 +38,7 @@
 CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_DM=y
 CONFIG_DM_I2C=y
+CONFIG_I2C_SET_DEFAULT_BUS_NUM=y
 # CONFIG_MMC is not set
 CONFIG_MTD=y
 CONFIG_DM_SPI_FLASH=y