beckham: Patch prebuilt P blobs to load libprocessgroup

* The symbol `set_sched_policy` users moved from libcutils
  to libprocessgroup, so change out the dependency.
* Pin the patched HAL, leave patching logic for when we want
  to update it.

Change-Id: I0151324ec561e2c8c1bcd12fb87254de0d92706a