lapic: skip setting intrcnt if lapic is not present

lapic: skip setting intrcnt if lapic is not present

Instead of panicking. Legacy PVH mode doesn't provide a lapic, and
since native_lapic_intrcnt is called unconditionally this would cause
the assert to trigger. Change the assert into a continue in order to
take into account the possibility of systems without a lapic.

Reviewed by:		jhb
Approved by:		re (gjb)
Sponsored by:		Citrix Systems R&D
Differential revision:	https://reviews.freebsd.org/D17015