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/ls1012afrwy_qspi_SECURE_BOOT_defconfig b/configs/ls1012afrwy_qspi_SECURE_BOOT_defconfig
index 9d35727..69c7926 100644
--- a/configs/ls1012afrwy_qspi_SECURE_BOOT_defconfig
+++ b/configs/ls1012afrwy_qspi_SECURE_BOOT_defconfig
@@ -38,6 +38,7 @@
 CONFIG_DM=y
 CONFIG_SATA_CEVA=y
 CONFIG_DM_I2C=y
+CONFIG_I2C_SET_DEFAULT_BUS_NUM=y
 CONFIG_FSL_ESDHC=y
 CONFIG_MTD=y
 CONFIG_DM_SPI_FLASH=y