i2c: Rename SPL/TPL_I2C_SUPPORT to I2C

Rename these options so that CONFIG_IS_ENABLED can be used with them.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Heiko Schocher <hs@denx.de>
diff --git a/configs/cm_t43_defconfig b/configs/cm_t43_defconfig
index b6db183..1d2fba9 100644
--- a/configs/cm_t43_defconfig
+++ b/configs/cm_t43_defconfig
@@ -28,7 +28,7 @@
 # CONFIG_MISC_INIT_R is not set
 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR=0x480
 CONFIG_SPL_FS_EXT4=y
-CONFIG_SPL_I2C_SUPPORT=y
+CONFIG_SPL_I2C=y
 CONFIG_SPL_MTD_SUPPORT=y
 # CONFIG_SPL_NAND_SUPPORT is not set
 CONFIG_SPL_NAND_DRIVERS=y