Fix endianess of PMac driver

Fix endianess of PMac driver for the latest change of dmix.
Now need to specify the (big-endian) format explicitly.

src/conf/cards/PMac.conf

@@ -0,0 +1,38 @@
+#
+# Configuration for PMac
+#
+
+<confdir:pcm/front.conf>
+
+PMac.pcm.front.0 {
+	@args [ CARD ]
+	@args.CARD {
+		type string
+	}
+	type hw
+	card $CARD
+	device 0
+}	
+
+# default with dmix/dsnoop
+PMac.pcm.default {
+	@args [ CARD ]
+	@args.CARD {
+		type string
+	}
+	type asym
+	playback.pcm {
+		type plug
+		slave.pcm {
+			@func concat
+			strings [ "dmix:CARD=" $CARD ",FORMAT=S16" ]
+		}
+	}
+	capture.pcm {
+		type plug
+		slave.pcm {
+			@func concat
+			strings [ "dsnoop:CARD=" $CARD ",FORMAT=S16" ]
+		}
+	}
+}