ImageReader: get correct jpeg size.

the jpeg size was set to the buffer width, which is the max jpeg buffer size.
the right size can be obtained by parsing the camera3_jpeg_blob data sent by
hal.

Also correct the buffer size check when crop is not set.

Bug: 9254294
Change-Id: Ic73de47ef97efa4eb356a399c1576715e2eacbfd
2 files changed