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kernel: export pcienumcaps() for custom capability enumeration in drivers (virtio)

This used to be a internal function, but virtio
uses multiple structures with the same cap type
to indicate the location of various register
blocks in the pci bars so export it.

--- a/sys/src/9/port/pci.c

+++ b/sys/src/9/port/pci.c

@@ -910,8 +910,8 @@

 	pcicfgw16(p, PciPCR, p->pcr);

 }

-static int

-enumcaps(Pcidev *p, int (*fmatch)(Pcidev*, int, int, int), int arg)

+int

+pcienumcaps(Pcidev *p, int (*fmatch)(Pcidev*, int, int, int), int arg)

 {

 	int i, r, cap, off;

@@ -971,13 +971,13 @@

 int

 pcicap(Pcidev *p, int cap)

 {

-	return enumcaps(p, matchcap, cap);

+	return pcienumcaps(p, matchcap, cap);

 }

 int

 pcihtcap(Pcidev *p, int cap)

 {

-	return enumcaps(p, matchhtcap, cap);

+	return pcienumcaps(p, matchhtcap, cap);

 }

 static int

--- a/sys/src/9/port/pci.h

+++ b/sys/src/9/port/pci.h

@@ -254,6 +254,7 @@

 extern int pcicap(Pcidev *p, int cap);

 extern int pcihtcap(Pcidev *p, int cap);

+extern int pcienumcaps(Pcidev *p, int (*fmatch)(Pcidev*, int, int, int), int arg);

 extern int pcimsienable(Pcidev *p, uvlong addr, ulong data);

 extern int pcimsidisable(Pcidev *p);