boards: arm: 96b_wistrio: Use STM32_OSPEEDR_VERY_HIGH_SPEED for SPI1_SCK

Add Add STM32_OSPEEDR_VERY_HIGH_SPEED flag for SPI1_SCK to function
properly. This is needed for the proper communication with the LoRa
modem. Without this flag, the received data is mangled when burst
read is performed.

Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>

boards/arm/96b_wistrio/pinmux.c

@@ -27,7 +27,8 @@ static const struct pin_config pinconf[] = {
 	{STM32_PIN_PB9, STM32L1X_PINMUX_FUNC_PB9_I2C1_SDA},
 #endif /* CONFIG_I2C_1 */
 #ifdef CONFIG_SPI_1
-	{STM32_PIN_PA5, STM32L1X_PINMUX_FUNC_PA5_SPI1_SCK},
+	{STM32_PIN_PA5, STM32L1X_PINMUX_FUNC_PA5_SPI1_SCK |
+			STM32_OSPEEDR_VERY_HIGH_SPEED},
 	{STM32_PIN_PA6, STM32L1X_PINMUX_FUNC_PA6_SPI1_MISO},
 	{STM32_PIN_PA7, STM32L1X_PINMUX_FUNC_PA7_SPI1_MOSI},
 #endif /* CONFIG_SPI_1 */