Enable NEW_PCIB on riscv.

Sponsored by:	DARPA, AFRL

sys/riscv/conf/DEFAULTS

@@ -11,3 +11,5 @@ device		mem		# Memory and kernel memory devices
 # Default partitioning schemes
 options 	GEOM_PART_BSD
 options 	GEOM_PART_MBR
+
+options 	NEW_PCIB

sys/riscv/include/resource.h

@@ -42,5 +42,8 @@
 #define	SYS_RES_MEMORY	3	/* i/o memory */
 #define	SYS_RES_IOPORT	4	/* i/o ports */
 #define	SYS_RES_GPIO	5	/* general purpose i/o */
+#ifdef NEW_PCIB
+#define	PCI_RES_BUS	6	/* PCI bus numbers */
+#endif
 
 #endif /* !_MACHINE_RESOURCE_H_ */