Add ADC to Sonata board file

sdk/boards/sonata-prerelease.json

diff --git a/sdk/boards/sonata-prerelease.json b/sdk/boards/sonata-prerelease.json
index 9a6dad6..d82e122 100644
--- a/sdk/boards/sonata-prerelease.json
+++ b/sdk/boards/sonata-prerelease.json
@@ -67,6 +67,10 @@
         "pwm": {
             "start" : 0x80001000,
             "length": 0x00001000
+        },
+        "adc": {
+            "start" : 0x8000B000,
+            "length": 0x00001000
         }
     },
     "instruction_memory": {