drivers: flash: stm32: ospi: writing single, dual and quad modes

Support writing to NOR-Flash over OSPI using
the following modes:

* 1-1-1
* 1-1-4
* 1-4-4

Supports 4-Byte opcodes conversion for write opcodes.

Allows users to set what write/program opcode is used
in the DTS (not for OPI mode).
Will use some default PP opcodes based on the mode.

Signed-off-by: Georgij Cernysiov <geo.cgv@gmail.com>