ARM: dts: Increase reserved memory for ppmgr/ppmgr0

This is the fix for unreliable playback of H265 with Kodi. Reported by wrstaxy
and [1] is relevant thread for this.

 [1] http://forum.kodi.tv/showthread.php?tid=231301



Change-Id: Ib77529837c9d112dfbdfdc30c697df1af81345d8
Signed-off-by: Dongjin Kim <tobetter@gmail.com>