cpufreq: schedutil: Ignore work_in_progress

Blindly ignoring frequency updates because of work_in_progress can leave
the CPUs at the wrong frequency for a long time. It's better to update the
frequency immediately than wait for a future event that might take a long
time to come. The irq_work code already ignores double queuing of work. So,
that part of the code is still safe when the work_in_progress flag is
ignored.

Change-Id: Id0b3711314dfbfa18b5f4bce30a239ee3cf962d6
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>
Signed-off-by: Saravana Kannan <skannan@codeaurora.org>
Signed-off-by: Rohit Gupta <rohgup@codeaurora.org>