configure: Move V4L2 M2M help line to the hardware library section

configure

@@ -185,7 +185,6 @@ Individual component options:
   --enable-filter=NAME     enable filter NAME
   --disable-filter=NAME    disable filter NAME
   --disable-filters        disable all filters
-  --disable-v4l2_m2m       disable V4L2 mem2mem code [autodetect]
 
 External library support:
 
@@ -320,6 +319,7 @@ External library support:
   --enable-omx             enable OpenMAX IL code [no]
   --enable-omx-rpi         enable OpenMAX IL code for Raspberry Pi [no]
   --enable-rkmpp           enable Rockchip Media Process Platform code [no]
+  --disable-v4l2-m2m       disable V4L2 mem2mem code [autodetect]
   --disable-vaapi          disable Video Acceleration API (mainly Unix/Intel) code [autodetect]
   --disable-vdpau          disable Nvidia Video Decode and Presentation API for Unix code [autodetect]
   --disable-videotoolbox   disable VideoToolbox code [autodetect]