camera2: Avoid boxing primitives while unmarshalling primitive arrays.

Bug: 174742989

Test: GCA (basic validity)

Test: Without this CL, capture many images with GCA, profile with
      simpleperf, stack traces with java.lang.Float.valueOf in
      mm_fault_count kprobes : 21% (most of them coming from
      MarshalQueryableArray.unmarshal)

Test: Without this CL, capture many images with GCA, profile with
      simpleperf, stack traces with java.lang.Float.valueOf in
      mm_fault_count kprobes : 3.92%

Test: camera CTS, no new failures.

Change-Id: If359c828a231df41ba7b586bdda36255656a5a76
Signed-off-by: Jayant Chowdhary <jchowdhary@google.com>