x86: Fix PCI UART compatible string for crownbay and galileo

With recent ns16550 driver changes, we only changed the legacy UART
(at I/O port 0x3f8) compatible string, but forgot to change the PCI
UART compatible string. Now fix it.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/dts/galileo.dts b/arch/x86/dts/galileo.dts
index 2342de7..55165e1 100644
--- a/arch/x86/dts/galileo.dts
+++ b/arch/x86/dts/galileo.dts
@@ -70,7 +70,7 @@
 					"pci8086,0936",
 					"pciclass,070002",
 					"pciclass,0700",
-					"x86-uart";
+					"ns16550";
 			u-boot,dm-pre-reloc;
 			reg = <0x0000a500 0x0 0x0 0x0 0x0
 			       0x0200a510 0x0 0x0 0x0 0x0>;