Allow device to declare compress offload and mmap offload mutually exclusive.

Compress offload and mmap offload may share the same offload implementation.
In that case, when device declares ro.audio.mmap_offload_exclusive, they are
mutually exclusive.

Bug: 411493285
Test: atest audiopolicy_tests
Flag: com.android.media.audioserver.mmap_pcm_offload_support
Change-Id: I64c97ee1b0fd97c9e00b0b0b5e0bdea0fdb735a9