Revert "stagefright: allow building LPA for legacy audio"

This reverts commit 7e830c2c844d2fccc1474bcf26c7a578bea6d8f9.
libstagefright: Add legacy LPAPlayer

Ported from change 46451 / Ie2551345bbf047c022d1fecbb7cb2cc4a4c97d72 from cm-10.2

Change-Id: I6ad282993a843883c3b4c3257f5b730ea0d13307

Conflicts:
	media/libstagefright/Android.mk
stagefright: allow building LPA for legacy audio

Change-Id: Ia4b5bffd3346e585ec5a6bff6659d0257fc5748a

Conflicts:
	media/libstagefright/Android.mk