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/Lamobo_R1_defconfig b/configs/Lamobo_R1_defconfig
index c7bea1c..d949f55 100644
--- a/configs/Lamobo_R1_defconfig
+++ b/configs/Lamobo_R1_defconfig
@@ -10,7 +10,7 @@
 CONFIG_GMAC_TX_DELAY=4
 CONFIG_AHCI=y
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
-CONFIG_SPL_I2C_SUPPORT=y
+CONFIG_SPL_I2C=y
 CONFIG_SCSI_AHCI=y
 CONFIG_B53_SWITCH=y
 CONFIG_B53_PHY_PORTS=0x1f