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/mk802_a10s_defconfig b/configs/mk802_a10s_defconfig
index 12e053c..082f461 100644
--- a/configs/mk802_a10s_defconfig
+++ b/configs/mk802_a10s_defconfig
@@ -7,7 +7,7 @@
 CONFIG_DRAM_EMR1=0
 CONFIG_USB1_VBUS_PIN="PB10"
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
-CONFIG_SPL_I2C_SUPPORT=y
+CONFIG_SPL_I2C=y
 CONFIG_AXP152_POWER=y
 CONFIG_CONS_INDEX=2
 CONFIG_USB_EHCI_HCD=y