mtd: spi-nor: Add support for Silicon Kaiser sk25lp128

Add support for Silicon Kaiser sk25lp128 SPI NOR flash found in Pine64
PinePhone Pro and PineTab2.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
diff --git a/drivers/mtd/spi/Kconfig b/drivers/mtd/spi/Kconfig
index 732b076..790d15f 100644
--- a/drivers/mtd/spi/Kconfig
+++ b/drivers/mtd/spi/Kconfig
@@ -176,6 +176,11 @@
 	help
 	  Add support for various Macronix SPI flash chips (MX25Lxxx)
 
+config SPI_FLASH_SILICONKAISER
+	bool "Silicon Kaiser SPI flash support"
+	help
+	  Add support for various Silicon Kaiser SPI flash chips (SK25Lxxx)
+
 config SPI_FLASH_SPANSION
 	bool "Spansion SPI flash support"
 	help