aoc: add support for backpressure notifications

When we read from a channel that was previously full,
the kernel signals AoC to let it know that there is now
space available.

Bug: 262291819
Test: manually tested on C10
Change-Id: I7b64f3ce078bed27b1f4154d1bf9a1ceaee5721f
Signed-off-by: Alex Iacobucci <alexiacobucci@google.com>
1 file changed