Update platform-tools sdk comp to 15.

Change-Id: Icdcf530ea223c1181b9be9bc1029f126c5558f1d
diff --git a/sdk/plat_tools_source.properties b/sdk/plat_tools_source.properties
index 92d8f34..ea0d089 100644
--- a/sdk/plat_tools_source.properties
+++ b/sdk/plat_tools_source.properties
@@ -1,2 +1,2 @@
 Pkg.UserSrc=false
-Pkg.Revision=14
\ No newline at end of file
+Pkg.Revision=15
\ No newline at end of file