sysutils/edk2: set IO port range properly for bhyve

Bhyve uses an io port range of [ 0x2000, 0x10000 ] [1]. At the moment,
EDKII is using a subset of this range [ 0xC000, 0x10000 ] [2]. Even
though the EDKII range doesn't exceed the bhyve range, it's causing
issues on some guests like OpenBSD. We don't know why it's causing
issues yet. However, using the same IO port range in EDKII fixes the
issue.

[1] https://github.com/freebsd/freebsd-src/blob/82ea0132c8b17a7a6067c8a36c6434e587ede6de/usr.sbin/bhyve/pci_emul.c#L133-L134
[2] https://github.com/tianocore/edk2/blob/fb044b7fe893a4545995bfe2701fd38e593355d9/OvmfPkg/Bhyve/PlatformPei/Platform.c#L156-L157

PR: 274389
Reviewed by: manu, markj
Approved by: manu
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D42627