Revert "libstagefright: Fix incorrectness nPortIndex value for QueryCodec"

This reverts commit 9a814ad626233ff02dd2d393929f32225bc94b68.
This is wrong. kPortIndexInput is defined as 0, the original value was correct.
Additionally, it breaks android.media.cts.MediaCodecListTest

Change-Id: Ib273cde69a4c622daf239bab5d12c5e7d568af2f
libstagefright: fix indefinate loop in QueryCodec

portFormat.nIndex is being incremented which is not
trustworthy since the nIndex value could be overriden
by the OMX Component,  which causes an indefinate loop
which inturn causes a memory leak and crashes the system.

OMX Component on encore and p970 exhibits this behaviour
(OMX.TI.720P.Decoder). This patch prevents stagefright
freezes when QueryCodec is called during Gallery Thumbnail
generation for videos and Adobe Flash playback.

Change-Id: I825c99ddecacbb927e22ac7d1a53facb26d95ff2