Resize image wallpaper surface to match bitmap size in order to optimize memory

(on AndroidTV there is no need for wallpaper and RAM is wasted)

Bug: 74517029
Test: Push a low resolution wallpaper to the device (adb push new_wallpaper /data/system/users/0/wallpaper),
reboot and check the buffer size for com.android.systemui.ImageWallpaper (adb shell dumpsys SurfaceFlinger)

Change-Id: I992175997ed09360e8fc9c2cabf354fb4fabd1f9