manifest: android-6.0.1_r80

This also reverts:

"asb-2017.05: fork platform/external/giflib"
commit 4873f2b4

"android: Switch to our freetype"
commit a325290d

"CVE-2016-5129: Fork of platform/external/v8"
commit 8debef2b

Mentioned repos were updated in android-6.0.1_r80,
we don't have additions.

Change-Id: I1f1b6bc4e871729912bfaa56cdde075b416fd42f