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/Bananapi_defconfig b/configs/Bananapi_defconfig
index 50c8adc..41d356b 100644
--- a/configs/Bananapi_defconfig
+++ b/configs/Bananapi_defconfig
@@ -9,7 +9,7 @@
 CONFIG_GMAC_TX_DELAY=3
 CONFIG_AHCI=y
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
-CONFIG_SPL_I2C_SUPPORT=y
+CONFIG_SPL_I2C=y
 CONFIG_NETCONSOLE=y
 CONFIG_SCSI_AHCI=y
 CONFIG_PHY_REALTEK=y