mtd: spi-nor: Add support for zBIT ZB25VQ128

Add support for the zBIT ZB25VQ128 (128M-bit) SPI NOR flash memory chip,
as used on the Xunlong Orange Pi Zero 3 board.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Dragan Simic <dsimic@manjaro.org>
diff --git a/drivers/mtd/spi/Kconfig b/drivers/mtd/spi/Kconfig
index 732b076..abed392 100644
--- a/drivers/mtd/spi/Kconfig
+++ b/drivers/mtd/spi/Kconfig
@@ -224,6 +224,11 @@
 	  Add support for various XTX (XTX Technology Limited)
 	  SPI flash chips (XT25xxx).
 
+config SPI_FLASH_ZBIT
+	bool "ZBIT SPI flash support"
+	help
+	  Add support for Zbit Semiconductor Inc. SPI flash chips (ZB25xxx).
+
 endif
 
 config SPI_FLASH_USE_4K_SECTORS