Modify handling of write to the vlapic SVR register.

The handler is now called after the register value is updated in the virtual
APIC page. This will make it easier to handle APIC-write VM-exits with APIC
register virtualization turned on.

Additionally, mask all the LVT entries when the vlapic is software-disabled.
Fixing build bustage.
Add D-Link DWA-140 rev D1, another RT5372/run(4).
From Anton Mazunin.
Regen.
In sys/amd64/vmm/intel/vmx.c, silence a (incorrect) gcc warning about
regval possibly being used uninitialized.

Reviewed by:	neel
Address some warnings which showed up on the userland version.

MFC after: 1 week
[automated] Merge in upstream-github/master