SoftXaac: types and allocations

Test: CTS android.media.cgts.DecoderTest{AacDrc,XheAac}
Bug: 77287124

Combined fixes for:

SoftXaac: Fix return types of member functions

Functions are updated to return IA_ERRORCODE

Bug: 80546260
Change-Id: If639b15da4d89065e0436e1afe741f510efe690d

SoftXaac: Moved MPEG D DRC allocations to init function

Tracking MPEG D Drc allocations in a different array now and ensure
every time a config data is passed, previously allocated DRC memory is
freed

Bug: 80548842
Change-Id: Icd07c94ef4b13abae937bfbfe65328d98b7df5e9

SoftXaac: Replaced memory arrays with Vectors

Bug: 109746745
Change-Id: Icbde1f9abd1dd534752b071f4f15d6f11673d4a3