ASoC: wcd: remove deprecated input prop

Remove code to set INPUT_PROP_NO_DUMMY_RELEASE bit in
MBHC input device property, as this is no longer needed.
This code was added as a workaround to ensure that keys
held during resume were not artificially released by the
input framework. This issue is already resolved by -
commit 768d9aa5
("Input: don't call input_dev_release_keys() in resume")

Change-Id: I02b78a390d504b58b0f693248061e6684c1d0445
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>