board: da8xxevm: Fix Environmental CRC error

When the spi_flash_probe_bus_cs() was previously called, it was
called using 0's for two values where CONFIG_ENV_SPI_MAX_HZ and
CONFIG_ENV_SPI_MODE are now used.  When changed this
caused the environment to fail the CRC check and the default
was used.  This patch defines both of these values back 0.

Fixes: 25a17652c9c2 ("fix: env: Fix the SPI flash device setup
for DM mode")

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/include/configs/da850evm.h b/include/configs/da850evm.h
index ba878eb..14a3046 100644
--- a/include/configs/da850evm.h
+++ b/include/configs/da850evm.h
@@ -124,8 +124,9 @@
 #ifdef CONFIG_SPL_BUILD
 #define CONFIG_SYS_SPI_BASE		DAVINCI_SPI1_BASE
 #define CONFIG_SF_DEFAULT_SPEED		30000000
-#define CONFIG_ENV_SPI_MAX_HZ	CONFIG_SF_DEFAULT_SPEED
 #endif
+#define CONFIG_ENV_SPI_MAX_HZ	0
+#define CONFIG_ENV_SPI_MODE	0
 
 #ifdef CONFIG_USE_SPIFLASH
 #define CONFIG_SYS_SPI_U_BOOT_OFFS	0x8000