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/pinecube_defconfig b/configs/pinecube_defconfig
index 4b7b410..abe2997 100644
--- a/configs/pinecube_defconfig
+++ b/configs/pinecube_defconfig
@@ -7,7 +7,7 @@
 CONFIG_DRAM_CLK=504
 CONFIG_DRAM_ODT_EN=y
 CONFIG_I2C0_ENABLE=y
-CONFIG_SPL_I2C_SUPPORT=y
+CONFIG_SPL_I2C=y
 # CONFIG_NETDEVICES is not set
 CONFIG_AXP209_POWER=y
 CONFIG_AXP_DCDC2_VOLT=1250