dsp: codecs: use native API to configure PCM output block in multiaac

Usage of q6asm_enc_cfg_blk_pcm() does not trigger PortSettingsChanged
event which is required for multi aac component.

Configure the PCM output block using q6asm_enc_cfg_blk_pcm_native()
which ensures that the event gets triggered.

CRs-Fixed: 2169255
Change-Id: I168aa0156c9233d81e99ca2aa6142f33ef10805c
Signed-off-by: Satya Krishna Pindiproli <satyak@codeaurora.org>