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-zynq/Kconfig b/arch/arm/mach-zynq/Kconfig
index 318e948..cf2e727 100644
--- a/arch/arm/mach-zynq/Kconfig
+++ b/arch/arm/mach-zynq/Kconfig
@@ -24,7 +24,7 @@
 config SPL_SPI_FLASH_SUPPORT
 	default y if ZYNQ_QSPI
 
-config SPL_SPI_SUPPORT
+config SPL_SPI
 	default y if ZYNQ_QSPI
 
 config ZYNQ_DDRC_INIT