boards: arm: 96b_wistrio: Use STM32_OSPEEDR_VERY_HIGH_SPEED for SPI1_SCK
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 <c29222e98de6437a383e8d946a9b202298e0aa3a@kernel.org>

nashif/zephyr,nashif/zephyr,galak/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,nashif/zephyr,finikorg/zephyr,Vudentz/zephyr,Vudentz/zephyr,finikorg/zephyr,nashif/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,finikorg/zephyr,galak/zephyr,Vudentz/zephyr,nashif/zephyr,galak/zephyr,galak/zephyr,Vudentz/zephyr,galak/zephyr