ARM: OMAP2+: common: remove use of vram

commit 966458f8

 OMAP: remove vram allocator

Removed the OMAP specific vram allocator but OMAP2 common was
still trying to use it and this lead to the following build error:

CC      arch/arm/mach-omap2/common.o
arch/arm/mach-omap2/common.c:19:23: fatal error: plat/vram.h: No such file or directory
compilation terminated.
make[1]: *** [arch/arm/mach-omap2/common.o] Error 1
make: *** [arch/arm/mach-omap2] Error 2

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Tony Lindgren <tony@atomide.com>