ARM: zynq: Disable the config CONFIG_SPI_FLASH_USE_4K_SECTORS

Lock size for the flashes will be in terms of sector size, so
disable the CONFIG_SPI_FLASH_USE_4K_SECTORS and read it from the
flash itself.

Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@amd.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/8e5c2bf3b7e5f366c4e261e8055ea254bda53aa9.1697117993.git.michal.simek@amd.com