Fix: Use RP Bar address when no downstream found #460

Job	Run time
run / Baremetal • SBSA (RDN2)	33s
run / setup	4s
run / Linux • SBSA	39m 41s
run / Linux • BSA	35m 58s
run / Baremetal • PC-BSA (RDN2)	21s
run / Baremetal • BSA (RDN2)	31s
run / Linux • PC-BSA	34m 59s
run / UEFI • arm-toolchain • MPAM ACPI	5m 6s
run / UEFI • arm-toolchain • BSA DT	5m 34s
run / UEFI • arm-toolchain • SBSA NIST	5m 56s
run / UEFI • arm-toolchain • SBSA ACPI	5m 57s
run / UEFI • arm-toolchain • PC-BSA ACPI	5m 41s
run / UEFI • arm-toolchain • DRTM ACPI	5m 24s
run / UEFI • arm-toolchain • BSA ACPI	5m 38s
run / UEFI • arm-toolchain • MEM-TEST ACPI	5m 20s
run / UEFI • gcc • BSA ACPI	5m 51s
run / UEFI • gcc • PFDI DT	5m 32s
run / UEFI • gcc • DRTM ACPI	5m 23s
run / UEFI • arm-toolchain • VBSA ACPI	5m 31s
run / UEFI • arm-toolchain • PFDI DT	5m 29s
run / UEFI • gcc • MPAM ACPI	5m 10s
run / UEFI • arm-toolchain • xBSA ACPI	5m 26s
run / UEFI • gcc • xBSA ACPI	5m 27s
run / UEFI • gcc • BSA DT	5m 37s
run / UEFI • gcc • SBSA ACPI	5m 55s
run / UEFI • gcc • VBSA ACPI	5m 16s
run / UEFI • gcc • MEM-TEST ACPI	5m 19s
run / UEFI • gcc • SBSA NIST	6m 3s
run / UEFI • gcc • PC-BSA ACPI	5m 29s
	3h 54m 11s

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