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/include/configs/ls1046a_common.h b/include/configs/ls1046a_common.h
index f49766b..289acc0 100644
--- a/include/configs/ls1046a_common.h
+++ b/include/configs/ls1046a_common.h
@@ -107,7 +107,7 @@
 #define CONFIG_SPL_LIBGENERIC_SUPPORT
 #define CONFIG_SPL_ENV_SUPPORT
 #define CONFIG_SPL_WATCHDOG
-#define CONFIG_SPL_I2C_SUPPORT
+#define CONFIG_SPL_I2C
 #define CONFIG_SPL_MPC8XXX_INIT_DDR_SUPPORT
 
 #define CONFIG_SPL_NAND_SUPPORT