Add support of PCI_RES_BUS to Marvell PCI driver

GENERIC ARM config use NEW_PCIB driver (https://wiki.freebsd.org/NEW_PCIB).
To satisfy it, allocation and deallocation of PCI_RES_BUS is necessary.
Conditional compilation is added for backward compatibility with ARMv5
configs.

Submitted by: Rafal Kozik <rk@semihalf.com>
Reviewed by: jhb
Obtained from: Semihalf
Sponsored by: Stormshield
Differential Revision: https://reviews.freebsd.org/D14748