get-prebuilts: Use https for Term.apk fetch

* Use secure protocol when fetching prebuilt APKs to avoid a MITM attack
  that could send a malicious APK instead.

Change-Id: If9dfc8bdc6f5a8ac360f40fe3fb423455082d224
Merge branch 'cm-11.0' of git://github.com/CyanogenMod/android_vendor_cm into cm-11.0