Add dynamic framebuffer support, and associated vghw utils needed. This code does not compile, and needs companion updates in graphics (3899db667a38) and qemu (c7e943dbf70f). Some code looks like syborg-specific so tagged with FAISALMEMON. Need to check with Jani on this. A later submission will declare when the code compiles again.
The guestvideohw.ldd now compiles ok. The graphics changeset e40433e31c87 is needed, or later. Only a stub has been put in for the dynamic framebuffer base address. This needs to be properly ported from Jani's earlier work on platsim.