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libweston: fbdev: Force the Framebuffer devices to be activated.

n3rdopolis requested to merge (removed):master into master

This attempts to wake up secondary framebuffer devices (/dev/fb1 and up) as usually these devices start powered off, and the FBIOPUT_VSCREENINFO ioctl turns it on. This was tested on qemu with two virtual QXL cards. This is a more precise way to activate framebuffer devices with the ioctl

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