vmm: Remove vcpuid from I/O port handlers.
No I/O ports are vCPU-specific (unlike memory which does have
vCPU-specific ranges such as the local APIC).
Reviewed by: corvink, markj
Differential Revision: https://reviews.freebsd.org/D37163
(cherry picked from commit 9388bc1e3a58ac17c06e690fb9f46c9f36098f2d)