sonata: created a v0.2 subdirectory for old drivers

Some drivers have changed significantly for the Sonata system v1.0.
This is a neat way to keep old drivers around for those who want to
remain on Sonata system v0.2.

sdk/boards/sonata-0.2.json

diff --git a/sdk/boards/sonata-0.2.json b/sdk/boards/sonata-0.2.json
index 308904a..9747b93 100644
--- a/sdk/boards/sonata-0.2.json
+++ b/sdk/boards/sonata-0.2.json
@@ -76,6 +76,7 @@
         "ipconfigDRIVER_INCLUDED_TX_IP_CHECKSUM=1"
     ],
     "driver_includes" : [
+        "../include/platform/sunburst/v0.2",
         "../include/platform/sunburst",
         "../include/platform/generic-riscv"
     ],

sdk/boards/sonata-prerelease.json

diff --git a/sdk/boards/sonata-prerelease.json b/sdk/boards/sonata-prerelease.json
index d82e122..d230a0d 100644
--- a/sdk/boards/sonata-prerelease.json
+++ b/sdk/boards/sonata-prerelease.json
@@ -4,10 +4,6 @@
             "start" : 0x30000000,
             "end"   : 0x30004000
         },
-        "gpio" : {
-            "start" : 0x80000000,
-            "end"   : 0x80000020
-        },
         "clint": {
             "start" : 0x80040000,
             "end"   : 0x80050000
@@ -32,26 +28,6 @@
             "start" : 0x80104000,
             "end"   : 0x80104034
         },
-        "i2c0": {
-            "start" : 0x80200000,
-            "end"   : 0x80200080
-        },
-        "i2c1": {
-            "start" : 0x80201000,
-            "end"   : 0x80201080
-        },
-        "spi0": {
-            "start" : 0x80300000,
-            "end"   : 0x80301000
-        },
-        "spi1": {
-            "start" : 0x80301000,
-            "end"   : 0x80302000
-        },
-        "spi2": {
-            "start" : 0x80302000,
-            "end"   : 0x80303000
-        },
         "rgbled" : {
             "start" : 0x80009000,
             "end"   : 0x80009020

sdk/include/platform/sunburst/v0.2/platform-i2c.hh

diff --git a/sdk/include/platform/sunburst/platform-i2c.hh b/sdk/include/platform/sunburst/v0.2/platform-i2c.hh
similarity index 100%
rename from sdk/include/platform/sunburst/platform-i2c.hh
rename to sdk/include/platform/sunburst/v0.2/platform-i2c.hh