mtd: spi-nor-ids: Reinstate Micron MT25QL02G

This ID disappeared in 5b66fdb2 ("mtd: spi: Remove unused files"),
add the ID back, since the chip is used on devices supported by U-Boot.

Fixes: 5b66fdb2 ("mtd: spi: Remove unused files")
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Horatiu Vultur <horatiu.vultur@microchip.com>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Vignesh R <vigneshr@ti.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>