drivers: flash: spi_nor: Set 4-byte addr mode via write instruction 0x17

Some flash devices enable entering the 4-byte address mode
by setting BIT(7) in a special register via a write instruction 0x17.
The support for this method is indicated in BIT(3) of
Enter 4-Byte Addressing byte in 16th DWORD of the JEDEC Basic
Flash Parameter Table.

Infineon's S25FL512S is an example flash device with this feature.

Signed-off-by: Andriy Gelman <andriy.gelman@gmail.com>