PM / devfreq: predef governors update freq when device is resumed

The predefined performance and powersave governors set the device
frequency on their startup only. That's not enough because the
frequency might have changed after device suspend-resume. With this
fix the governors re-set the required device frequency every time
a device get resumed.

Change-Id: I47ac877fc9e2cfbfc4a46cc676d6f2f838cd41d6
Signed-off-by: Vladimir Razgulin <vrazguli@codeaurora.org>