manifest: remove external/connectivity

* aosp no longer tracks this and it causes build errors due to the
  lack of libstlport

Change-Id: Ie705caf9e5f2cc80dce0a2925ee5264509a2bed3

default.xml

@@ -49,7 +49,6 @@
   <project path="external/bouncycastle" name="CyanogenMod/android_external_bouncycastle" />
   <project path="external/bson" name="CyanogenMod/android_external_bson" />
   <project path="external/busybox" name="CyanogenMod/android_external_busybox" />
-  <project path="external/connectivity" name="CyanogenMod/android_external_connectivity" />
   <project path="external/curl" name="CyanogenMod/android_external_curl" />
   <project path="external/dhcpcd" name="CyanogenMod/android_external_dhcpcd" groups="pdk-cw-fs" />
   <project path="external/dnsmasq" name="CyanogenMod/android_external_dnsmasq" groups="pdk" />