sm8550-common: init: Set media_variant properties

Set system side media_variant properties based on
target_variant property. This is done in vendor_init
context since media_variant properties can only be
set by vendor_init.

Also, set the target_variant property for kona in
early_boot script.

Change-Id: I0aee83dacd1888867c90c8bf8e340e265ec203f7

init/init.qcom.early_boot.sh

@@ -311,6 +311,7 @@ case "$target" in
     "kona")
         case "$soc_hwplatform" in
             *)
+                setprop vendor.media.target_variant "_kona"
                 if [ $fb_width -le 1600 ]; then
                     setprop vendor.display.lcd_density 560
                 else