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/common/spl/Kconfig b/common/spl/Kconfig
index 1f6e4b6..9552ed4 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -647,7 +647,7 @@
 	  for example. Enable this option to build the drivers in
 	  drivers/gpio as part of an SPL build.
 
-config SPL_I2C_SUPPORT
+config SPL_I2C
 	bool "Support I2C"
 	help
 	  Enable support for the I2C (Inter-Integrated Circuit) bus in SPL.
@@ -1501,10 +1501,10 @@
 	  for example. Enable this option to build the drivers in
 	  drivers/gpio as part of an TPL build.
 
-config TPL_I2C_SUPPORT
+config TPL_I2C
 	bool "Support I2C"
 	help
-	  Enable support for the I2C bus in TPL. See SPL_I2C_SUPPORT for
+	  Enable support for the I2C bus in TPL. See SPL_I2C for
 	  details.
 
 config TPL_LIBCOMMON_SUPPORT