Revert "Revert "PM / devfreq: bimc-bwmon: Use free_irq during governor suspend/stop""

This reverts commit 74e40b2a.

Change-Id: Ie363a279b8adf2f370d32da7a5b015a97f8b8271
Signed-off-by: Vinay Verma <vvinay@codeaurora.org>