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sdnvme: use delay() instead of tsleep() in nvmedisable()

SDifc.disable() can be called from:

reboot() -> chandevshutdown() -> sdshutdown()

... which has interrupts disabled (and we should
not re-enable them).

Also dont waste 100ms in sleeping as a usual drive can
complete its controller disable and shutdown notification
in just a few ms (< 4ms).

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

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

@@ -521,18 +521,18 @@

 	/* notify normal power off */

 	ctlr->reg[CCfg] = (ctlr->reg[CCfg] & ~(3<<14)) | 1<<14;

-	for(i = 0; i < 30; i++){

+	for(i = 0; i < 3000; i++){

 		if((ctlr->reg[CSts] & 0xc) == 0x8)

 			break;

-		tsleep(&up->sleep, return0, nil, 100);

+		delay(1);

 	}

 	/* disable controller */

 	ctlr->reg[CCfg] = 0;

-	for(i = 0; i < 10; i++){

+	for(i = 0; i < 1000; i++){

 		if((ctlr->reg[CSts] & 1) == 0)

 			break;

-		tsleep(&up->sleep, return0, nil, 100);

+		delay(1);

 	}

 	snprint(name, sizeof(name), "%s (%s)", sd->name, sd->ifc->name);