Have AssetFileDescriptor.AutoCloseInputStream have different

implementation based on file descriptor type

For non seekable file decriptor like FIFO, keep original solution. For
seekable file descriptor, implement with pread. Because previously two
AssetFileDescriptors pointing to the same file could be using the same
underlying file descriptor and reading from both would provide unexpected results since they would both modify the file offset in the kernel data structure.

Test: Added new tests and verified affected pass
Bug: 168310122
Change-Id: I7599c43ab38b1bb15cc0999feb94e6412db40d9a