Merge "stagefright: add -P pixelformat flag for -t (thumbnail) option in stagefright" am: a7fb63b84d am: 88df2b87fa am: e78ca40aab

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/1964479

Change-Id: Ia897b6e0b87e538af99de2c7f5d7a34df0ab9242