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/am57xx_evm_defconfig b/configs/am57xx_evm_defconfig
index 35abf6f..0975182 100644
--- a/configs/am57xx_evm_defconfig
+++ b/configs/am57xx_evm_defconfig
@@ -12,7 +12,7 @@
 CONFIG_SPL=y
 CONFIG_ENV_OFFSET_REDUND=0x280000
 CONFIG_SPL_SPI_FLASH_SUPPORT=y
-CONFIG_SPL_SPI_SUPPORT=y
+CONFIG_SPL_SPI=y
 CONFIG_ARMV7_LPAE=y
 CONFIG_AHCI=y
 CONFIG_DISTRO_DEFAULTS=y