Enable reuse of LinearBlock for during secure playback

 The mapping of the linearblock is kept open until a call to
 recycle() is done. Users are allowed to use the space in the linear
 block if available. Behaviour of using overlapping memory location
 is undefined.

Bug: 331921194
Test: atest  CtsMediaDrmFrameworkTestCases

Change-Id: I5d81be242a2187fe3a57a5474804482e64a5b083