Revert "input: powerkey: don't send dummy release event"

This reverts commit d796ae6e8878daecf855d23658c546aeef506142
("input: powerkey: don't send dummy release event") which 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: I542837eddce7cb1ffba55c3e5d6b2e5bd12c9e62
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>