change the default assumption.  assume that any unknown
ahci device will work.

Reference: /n/atom/patch/applied2013/ahcidefaultok
Date: Wed Nov 20 00:19:05 CET 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/9/pc/sdiahci.c	Wed Nov 20 00:17:41 2013
+++ /sys/src/9/pc/sdiahci.c	Wed Nov 20 00:17:41 2013
@@ -2025,7 +2025,7 @@
 	type = Tahci;
 	switch(p->vid){
 	default:
-		return -1;
+		break;
 	case 0x8086:
 		for(i = 0; i < nelem(itab); i += 3)
 			if((p->did & itab[i]) == itab[i+1])
@@ -2045,11 +2045,6 @@
 		if(p->did == 0x3349)
 			return Tahci;
 		break;
-	case 0x10de:
-	case 0x1039:
-	case 0x1b4b:
-	case 0x11ab:
-		break;
 	case 0x197b:
 	case 0x10b9:
 		type = Tjmicron;
@@ -2090,7 +2085,8 @@
 		s = sdevs + niactlr;
 		memset(c, 0, sizeof *c);
 		memset(s, 0, sizeof *s);
-		io = p->mem[Abar].bar & ~0xf;
+		c->type = cttab + type;
+		io = p->mem[Abar].bar & ~(uintmem)0xf;
 		c->mmio = vmap(io, p->mem[Abar].size);
 		if(c->mmio == nil){
 			print("%s: %T: address %#P in use\n",
@@ -2099,7 +2095,6 @@
 		}
 		c->lmmio = (u32int*)c->mmio;
 		c->pci = p;
-		c->type = cttab + type;
 
 		s->ifc = &sdiahciifc;
 		s->idno = 'E';
--- /sys/src/9/pcpae/sdiahci.c	Wed Nov 20 00:17:41 2013
+++ /sys/src/9/pcpae/sdiahci.c	Wed Nov 20 00:17:42 2013
@@ -2025,7 +2025,7 @@
 	type = Tahci;
 	switch(p->vid){
 	default:
-		return -1;
+		break;
 	case 0x8086:
 		for(i = 0; i < nelem(itab); i += 3)
 			if((p->did & itab[i]) == itab[i+1])
@@ -2045,11 +2045,6 @@
 		if(p->did == 0x3349)
 			return Tahci;
 		break;
-	case 0x10de:
-	case 0x1039:
-	case 0x1b4b:
-	case 0x11ab:
-		break;
 	case 0x197b:
 	case 0x10b9:
 		type = Tjmicron;
@@ -2090,7 +2085,8 @@
 		s = sdevs + niactlr;
 		memset(c, 0, sizeof *c);
 		memset(s, 0, sizeof *s);
-		io = p->mem[Abar].bar & ~0xf;
+		c->type = cttab + type;
+		io = p->mem[Abar].bar & ~(uintmem)0xf;
 		c->mmio = vmap(io, p->mem[Abar].size);
 		if(c->mmio == nil){
 			print("%s: %T: address %#P in use\n",
@@ -2099,7 +2095,6 @@
 		}
 		c->lmmio = (u32int*)c->mmio;
 		c->pci = p;
-		c->type = cttab + type;
 
 		s->ifc = &sdiahciifc;
 		s->idno = 'E';
--- /sys/src/nix/k10/sdahci.c	Wed Nov 20 00:17:42 2013
+++ /sys/src/nix/k10/sdahci.c	Wed Nov 20 00:17:42 2013
@@ -1774,7 +1774,7 @@
 	type = Tahci;
 	switch(p->vid){
 	default:
-		return -1;
+		break;
 	case 0x8086:
 		for(i = 0; i < nelem(itab); i += 3)
 			if((p->did & itab[i]) == itab[i+1])
@@ -1793,11 +1793,6 @@
 		 */
 		if(p->did == 0x3349)
 			return Tahci;
-		break;
-	case 0x10de:
-	case 0x1039:
-	case 0x1b4b:
-	case 0x11ab:
 		break;
 	case 0x197b:
 	case 0x10b9: