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/brppt2_defconfig b/configs/brppt2_defconfig
index af15a58..517eb94 100644
--- a/configs/brppt2_defconfig
+++ b/configs/brppt2_defconfig
@@ -21,7 +21,7 @@
 CONFIG_SPL=y
 CONFIG_SYS_BOOTCOUNT_SINGLEWORD=y
 CONFIG_SPL_SPI_FLASH_SUPPORT=y
-CONFIG_SPL_SPI_SUPPORT=y
+CONFIG_SPL_SPI=y
 # CONFIG_CMD_BMODE is not set
 # CONFIG_EXPERT is not set
 CONFIG_SYS_LOAD_ADDR=0x10700000