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/arch/arm/mach-sunxi/board.c b/arch/arm/mach-sunxi/board.c
index e979e42..d9b04f7 100644
--- a/arch/arm/mach-sunxi/board.c
+++ b/arch/arm/mach-sunxi/board.c
@@ -339,7 +339,7 @@
 	spl_init();
 	preloader_console_init();
 
-#ifdef CONFIG_SPL_I2C_SUPPORT
+#ifdef CONFIG_SPL_I2C
 	/* Needed early by sunxi_board_init if PMU is enabled */
 	i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
 #endif