drivers: flash: stm32_ospi: cleanup STM32H5-related quirks

STM32H5 series now uses the dedicated `flash_stm32_xspi` driver instead.
Remove all quirks related to H5 in the STM32 OSPI driver.

Signed-off-by: Mathieu Choplain <mathieu.choplain-ext@st.com>
3 files changed