msm: Add indicator for separate metadata buffers support

Add variable to check if separate metabuffers can be
enabled in video driver for specific targets.

Change-Id: I0ab3be7077d7d8286bfaa37be63705992939b72d
Signed-off-by: Deepak Verma <dverma@codeaurora.org>

Conflicts:
	arch/arm/mach-msm/devices-8064.c
	arch/arm/mach-msm/devices-8930.c
	arch/arm/mach-msm/devices-8960.c
	arch/arm/mach-msm/devices-msm8x60.c