mtd: spi-nor: add Gigadevice gd25lq128d support

Tested on the Amlogic aml-libretech-pc platform which does not support
dual or quad modes

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
[tudor.ambarus@microchip.com: order entry alphabetically]
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>