v4l2: vb2: replace VIDEO_MAX_FRAME with VB2_MAX_FRAME

- vb2 drivers to rely on VB2_MAX_FRAME.

- VB2_MAX_FRAME bumps the value to 64 from current 32

Change-Id: I3d7998898df43553486166c44b54524aac449deb
Signed-off-by: Divneil Wadhawan <divneil.wadhawan@xxxxxx>
Patch-mainline: linux-media @ Mon, 7 Jul 2014 12:57:27 +0530
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>