Switch default gcc toolchain from 4.4.3 to 4.6.

Switch both arm-linux-androideabi toolchainand arm-eabi toolchain.

Change-Id: I7b2771fe684853ab37e3b5b7cfe4146f9f901e02
diff --git a/tools/adbs b/tools/adbs
index 1a400f7..598af85 100755
--- a/tools/adbs
+++ b/tools/adbs
@@ -140,13 +140,13 @@
     uname = "darwin-x86"
   elif uname == "Linux":
     uname = "linux-x86"
-  prefix = "./prebuilt/" + uname + "/toolchain/arm-linux-androideabi-4.4.x/bin/"
+  prefix = "./prebuilts/gcc/" + uname + "/arm/arm-linux-androideabi-4.6/bin/"
   addr2line_cmd = prefix + "arm-linux-androideabi-addr2line"
 
   if (not os.path.exists(addr2line_cmd)):
     try:
-      prefix = os.environ['ANDROID_BUILD_TOP'] + "/prebuilt/" + uname + \
-               "/toolchain/arm-linux-androideabi-4.4.x/bin/"
+      prefix = os.environ['ANDROID_BUILD_TOP'] + "/prebuilts/gcc/" + \
+               uname + "/arm/arm-linux-androideabi-4.6/bin/"
     except:
       prefix = "";