envsetup: Remove call to deprecated function

This allows us to get rid of the following warning when running
`breakfast` command:

add_lunch_combo is obsolete. Use COMMON_LUNCH_CHOICES in your AndroidProducts.mk instead.

Change-Id: I5b05515465d40b9b77f74c69293a1431c5325f5d

build/envsetup.sh

@@ -68,15 +68,6 @@ function breakfast()
 {
     target=$1
     local variant=$2
-    LINEAGE_DEVICES_ONLY="true"
-    unset LUNCH_MENU_CHOICES
-    add_lunch_combo full-eng
-    for f in `/bin/ls vendor/lineage/vendorsetup.sh 2> /dev/null`
-        do
-            echo "including $f"
-            . $f
-        done
-    unset f
 
     if [ $# -eq 0 ]; then
         # No arguments, so let's have the full menu