misc: add sl28cpld base driver

Add a multi-function device driver which will probe its children and
provides methods to access the device.

Signed-off-by: Michael Walle <michael@walle.cc>
[Rebased]
Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 0ade3e3..7029bb7 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -512,4 +512,12 @@
 config FSL_IFC
 	bool
 
+config SL28CPLD
+	bool "Enable Kontron sl28cpld multi-function driver"
+	depends on DM_I2C
+	help
+	  Support for the Kontron sl28cpld management controller. This is
+	  the base driver which provides common access methods for the
+	  sub-drivers.
+
 endmenu