drivers: flash: stm32: qspi: support 1-4-4 and 1-1-4 quad read modes

Adds support for 1-4-4 and 1-1-4 read modes.

SFDP is used to query for available read instructions, then the
fastest one is used.

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