dts: bindings: ospi: Require STM32 OSPI clock-names binding
dts: bindings: ospi: Require STM32 OSPI clock-names binding

Following the modification of the STM32 OSPI driver, the clock-names
binding is now required

Signed-off-by: Guillaume Gautier <e28e80dbfe775b004d795f1da419a83f9db15384@st.com>

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