find7: Remove noemulatedsd from external sdcard

vold only supports a single partition for asec.  Use the internal
sdcard for asec to preserve existing behavior.

Change-Id: Ib297942d7ef7b6ed43f968f533be37d42a987b23
find7: Remove duplicate mixer path defaults

Change-Id: I540a4559ae7e5d16dd2fde8d9cb3bbe53518bffd