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/arch/arm/Kconfig b/arch/arm/Kconfig
index 69cf861..d49f26f 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -990,7 +990,7 @@
 	imply SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION
 	imply SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION_TYPE
 	imply SPL_SPI_FLASH_SUPPORT
-	imply SPL_SPI_SUPPORT
+	imply SPL_SPI
 	imply L2X0_CACHE
 
 config ARCH_SUNXI