ANDROID: goldfish: add ranchu defconfigs

Change-Id: I73ef1b132b6203ae921a1e1d4850eaadf58f8926

[AmitP: Folded following android-4.9 commit changes into this patch
        b821439faf75 ("ANDROID: arm64: rename ranchu defconfig to ranchu64")
        1a03fc05a569 ("ANDROID: goldfish: enable CONFIG_INET_DIAG_DESTROY")
        2bed6160b367 ("ANDROID: goldfish: disable GOLDFISH_SYNC")
        ec6a764367a4 ("ANDROID: goldfish_sync: update defconfig for 4.9-compatible version")]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>