net: stmmac: Low power management with IPA offload

Added support for Suspend and resume with ipa offload,
additionally optimized the ipa functionality, fixed issues
related to ipa locks initialisation.

Change-Id: If2321042610a409b8788759bc27c01385be8eae5
Acked-by: Abhishek Chauhan <abchauha@qti.qualcomm.com>
Signed-off-by: Sunil Paidimarri <hisunil@codeaurora.org>