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/brsmarc1_defconfig b/configs/brsmarc1_defconfig
index a7963d3..4a18eb8 100644
--- a/configs/brsmarc1_defconfig
+++ b/configs/brsmarc1_defconfig
@@ -37,7 +37,7 @@
 CONFIG_SPL_SYS_MALLOC_SIMPLE=y
 CONFIG_SPL_SEPARATE_BSS=y
 # CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR is not set
-CONFIG_SPL_I2C_SUPPORT=y
+CONFIG_SPL_I2C=y
 # CONFIG_SPL_NAND_SUPPORT is not set
 CONFIG_SPL_DM_SPI_FLASH=y
 CONFIG_SPL_POWER=y