am335x_evm: Add comment by SPL SPI support

Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/include/configs/am335x_evm.h b/include/configs/am335x_evm.h
index 5ed1dca..4e6429c 100644
--- a/include/configs/am335x_evm.h
+++ b/include/configs/am335x_evm.h
@@ -240,12 +240,14 @@
 #define CONFIG_SPL_ENV_SUPPORT
 #define CONFIG_SPL_NET_VCI_STRING	"AM335x U-Boot SPL"
 
+/* SPI flash. */
 #define CONFIG_SPL_SPI_SUPPORT
 #define CONFIG_SPL_SPI_FLASH_SUPPORT
 #define CONFIG_SPL_SPI_LOAD
 #define CONFIG_SPL_SPI_BUS		0
 #define CONFIG_SPL_SPI_CS		0
 #define CONFIG_SYS_SPI_U_BOOT_OFFS	0x20000
+
 #define CONFIG_SPL_LDSCRIPT		"$(CPUDIR)/am33xx/u-boot-spl.lds"
 
 #ifdef CONFIG_NAND