msm: msm_bus: Ignore -EBUSY from RPMH when sending AWAKE requests

Since the msm bus driver does not have a way to differentiate between
the state of the display RSC. It will attempt to send AWAKE requests
regardless of display RSC state, which are invalid when the display
RSC is in solver mode. The requests are ignored and the error returned
is benign, but is flooding kernel logging and causing hangs.

Change-Id: Ib5ca20146d52312873b5ed01911aac4e6e4f0f15
Signed-off-by: David Dai <daidavid1@codeaurora.org>