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nusb/lib: add setconf() to set the configuration

--- a/sys/src/cmd/nusb/lib/dev.c

+++ b/sys/src/cmd/nusb/lib/dev.c

@@ -483,6 +483,16 @@

 }

 int

+setconf(Dev *d, Conf *c)

+{

+	if(usbcmd(d, Rh2d|Rstd|Rdev, Rsetconf, c->cval, 0, nil, 0) > 0) {

+		werrstr("setconf: %s: %r", d->dir);

+		return -1;

+	}

+	return 0;

+}

+

+int

 setalt(Dev *d, Iface *ifc)

 {

 	if(usbcmd(d, Rh2d|Rstd|Riface, Rsetiface, ifc->alt, ifc->id, nil, 0) < 0){

--- a/sys/src/cmd/nusb/lib/usb.h

+++ b/sys/src/cmd/nusb/lib/usb.h

@@ -353,6 +353,7 @@

 int	unstall(Dev *dev, Dev *ep, int dir);

 int	usbcmd(Dev *d, int type, int req, int value, int index, uchar *data, int count);

 Dev*	getdev(char *devid);

+int	setconf(Dev *d, Conf *c);

 int	setalt(Dev *d, Iface *ifc);

 extern int usbdebug;	/* more messages for bigger values */