hrtimer.h: prevent pinned timer state from breaking inactive test

An hrtimer may be pinned to a CPU but inactive, so it is no longer valid
to test the hrtimer.state struct member as having no bits set when inactive.
Changed the test function to mask out the HRTIMER_STATE_PINNED bit when
checking for inactive state.

Signed-off-by: Gary S. Robertson <gary.robertson@linaro.org>
[ohaugan@codeaurora.org: Port to 4.4]
Git-commit: 902e4d4eb0d2158d2792166221a72a829caecf07
Git-repo: git://git.linaro.org/people/mike.holmes/santosh.shukla/lng-isol.git


Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>

Change-Id: Icb4156f4b7cb10138ea6c5cd5b762e35dc25428d
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>