add trunksize as restriction for function parseClearEncryptedSizes()

Without trunksize as restriction, function parseClearEncryptedSized()
can read the rest of file. If the file has a large number of saiz trunk,
large number of bytes will be copied, which can lead to high cost of
CPU time.

Bug: 124777526
Test: please see #3 and #8 in bug report:
	push senc.mp4 to devices's sdcard
	open photo app
	manuly print log
Change-Id: I854765c82d02d541b92f2658673aa4ce61fb5412