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/mach-stm32mp/Kconfig b/arch/arm/mach-stm32mp/Kconfig
index cd0e879..69d56c2 100644
--- a/arch/arm/mach-stm32mp/Kconfig
+++ b/arch/arm/mach-stm32mp/Kconfig
@@ -22,7 +22,7 @@
 	imply SPL_BOOTSTAGE if BOOTSTAGE
 	imply SPL_DISPLAY_PRINT
 	imply SPL_LIBDISK_SUPPORT
-	imply SPL_SPI_LOAD if SPL_SPI_SUPPORT
+	imply SPL_SPI_LOAD if SPL_SPI
 
 config SYS_SOC
 	default "stm32mp"