misc: pmem: Retry again a few times if DMA allocation fails

When using CMA for PMEM, it could be useful to retry again a few times
if DMA allocation fails, so as to be able to reserve any memory in the
meantime freed.
Revert "msm: rpc: add shutdown and restart handler for rpc"

This reverts commits:
bc695be83a99aebcff93fbdc974598aae7140e41
9b35819c2d4cfb14783ff82437940f03af1c2bb2