Signal eof flag for each input buffer

As the client sends single frame worth of data for processing all
the time, at the time of dispatch, signal eof flag for each buffer.

Also code that was repititive and doesnt serve any need is removed.

Test: make vts -j99 BUILD_GOOGLE_VTS=true TARGET_PRODUCT=aosp_arm64 \
&& vts-tradefed run commandAndExit vts \
--skip-all-system-status-check --primary-abi-only \
--skip-preconditions --module VtsHalMediaOmxV1_0Host \
-l INFO

Bug: 63796949

Change-Id: I530cbe69c27f5e4b1fae56ab808ef63107586275