Cannot play 3gp file which esds box is over 256 bytes

The size of chunk box "esds" is over 256 bytes, which is
Android default maximum size. There is much rubbish data
in esds box except valid data. MPEG4Extractor uses
uint8_t buffer[256] to handle esds box buffer, but sometimes
it is not enough, so it returns error and cannot play.

Solution: remove size check code and let malloc to prevent
too large size.

Bug: 122746531
Test: Play a video file whose esds size is over 256 bytes
and check if it can play normally

Change-Id: I2384bf8fc54e3f0c3a7d1351896bb408560b6490