drivers: wifi: eswifi: fix spi bus initialization
drivers: wifi: eswifi: fix spi bus initialization

spi_dt_spec structure initialization should not be done
in the runtime during spi bus initialization because it
caues kernel panic.

Fixes: https://github.com/zephyrproject-rtos/zephyr/issues/43046

Signed-off-by: Bartosz Bilas <c9544010575ed4e48ae813e3d4bf273cb2e959c4@hotmail.com>

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