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/imx8mq_cm_defconfig b/configs/imx8mq_cm_defconfig
index 4fff0cd..e0a038b 100644
--- a/configs/imx8mq_cm_defconfig
+++ b/configs/imx8mq_cm_defconfig
@@ -26,7 +26,7 @@
 CONFIG_BOARD_LATE_INIT=y
 CONFIG_SPL_BOARD_INIT=y
 CONFIG_SPL_SEPARATE_BSS=y
-CONFIG_SPL_I2C_SUPPORT=y
+CONFIG_SPL_I2C=y
 CONFIG_SYS_PROMPT="u-boot=> "
 CONFIG_CMD_FUSE=y
 CONFIG_CMD_GPIO=y