msm: ipa: update the MHIP rp moderation threshold for APQ IPA

Set update rp moderation count to 1 which will make IPA host
return buffers to IPA Device side for each buffer copy.


Change-Id: If8795acf5f8b52657bd09a3c100e5b1dc5763025
Acked-by: Jyothij <jyothij@qti.qualcomm.com>
Signed-off-by: Michael Adisumarta <madisuma@codeaurora.org>