Fix MMAP stream perm check

Fix issue in refactoring APM permission checking where the MMAP path
was missing a call to the perm check.

Fixes: 380479018
Flag: EXEMPT bugfix
Test: atest CtsNativeMediaAAudioTestCases
Change-Id: I85b9a8329c988d469d28f45e06c1d159a127ef7c
1 file changed