We already have the MTD_SPI_NOR_USE_4K_SECTORS option handling in C code
for 4K erase block support. Alas this 4K erase block support code
can't be used because the MTD_SPI_NOR_USE_4K_SECTORS option support
is missed in Kconfig.

This patch imports necessary Kconfig MTD_SPI_NOR_USE_4K_SECTORS option
declaration from linux v4.11-rc8.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>