hammerhead: Improve persistent RAM sequencing

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
defconfig: Disable MultiROM support

* This "HACK" no longer works after recent updates
  for memory allocation.
* No need to delay boot and waste memory for it.

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
out: Add pre-configured Audio policy

* This is pre-configured audio policy to support
  new formats and rates.
* Tested for several days, it's effective and
  works well. Let's add it by default since CM11
  has abandoned updates.

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>