drivers: flash: stm32: remove dependeny on XIP for memory map

Remove XIP dependency for enabling memory mapping for Q/O/XSPI NOR Flash.
It is not necessary and is preventing configuring an external Flash in
memmap mode if there is no internal Flash (like on STM32N6)

Signed-off-by: Guillaume Gautier <guillaume.gautier-ext@st.com>
1 file changed