Removed FB_UVESA (framebuffer) support and sys-apps/v86d

Also disabled "fbinit" boot service.
Removed "video=800x600-32" setting in syslinux.cfg.

VMware framebuffer should be now automatically initialized
due to DRM_VMWGFX_FBCON; QEMU's Cirrus emulation is supported
via DRM_CIRRUS_QEMU, so there is no point in continuing with
FB_UVESA just for the sake of framebuffer on old cards, especially
since video=800x600-32 interferes with DRM_CIRRUS_QEMU.