spi: Rename SPI_SUPPORT to SPI

Rename these options so that CONFIG_IS_ENABLED can be used with them.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/dh_imx6_defconfig b/configs/dh_imx6_defconfig
index 6d20a99..eb588b6 100644
--- a/configs/dh_imx6_defconfig
+++ b/configs/dh_imx6_defconfig
@@ -25,7 +25,7 @@
 CONFIG_SYS_BOOTCOUNT_SINGLEWORD=y
 CONFIG_ENV_OFFSET_REDUND=0x110000
 CONFIG_SPL_SPI_FLASH_SUPPORT=y
-CONFIG_SPL_SPI_SUPPORT=y
+CONFIG_SPL_SPI=y
 CONFIG_AHCI=y
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_FIT=y