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/Kconfig b/arch/Kconfig
index 382dd6e..abb7488 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -261,7 +261,7 @@
 	imply SPL_LIBGENERIC_SUPPORT
 	imply SPL_SERIAL
 	imply SPL_SPI_FLASH_SUPPORT
-	imply SPL_SPI_SUPPORT
+	imply SPL_SPI
 	imply SPL_OF_CONTROL
 	imply SPL_TIMER
 	imply SPL_REGMAP