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/MK808C_defconfig b/configs/MK808C_defconfig
index f2c1019..6f003f8 100644
--- a/configs/MK808C_defconfig
+++ b/configs/MK808C_defconfig
@@ -5,6 +5,6 @@
 CONFIG_MACH_SUN7I=y
 CONFIG_DRAM_CLK=384
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
-CONFIG_SPL_I2C_SUPPORT=y
+CONFIG_SPL_I2C=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_OHCI_HCD=y