Added the location of more of Sonata's UART devices.

sdk/boards/sonata-prerelease.json

diff --git a/sdk/boards/sonata-prerelease.json b/sdk/boards/sonata-prerelease.json
index 7fa2a6b..1df5862 100644
--- a/sdk/boards/sonata-prerelease.json
+++ b/sdk/boards/sonata-prerelease.json
@@ -20,6 +20,18 @@
             "start" : 0x80101000,
             "end"   : 0x80101034
         },
+        "uart2": {
+            "start" : 0x80102000,
+            "end"   : 0x80102034
+        },
+        "uart3": {
+            "start" : 0x80103000,
+            "end"   : 0x80103034
+        },
+        "uart4": {
+            "start" : 0x80104000,
+            "end"   : 0x80104034
+        },
         "i2c0": {
             "start" : 0x80200000,
             "end"   : 0x80200080