Mark NDK renderscript APIs as deprecated at API level 31.

This CL marks RenderScript NDK APIs as deprecated.

Bug: 168711199
Test: m
Test: CtsRenderscriptTestCases
Test: CtsRsCppTestCases
Test: CtsRsBlasTestCases
Change-Id: Ibe6daa6c70fb2c855b695d21722bf7f5bf8ae212

Android.bp

diff --git a/Android.bp b/Android.bp
index f726891..9679d92 100644
--- a/Android.bp
+++ b/Android.bp
@@ -14,6 +14,7 @@
         "-Werror",
         "-Wall",
         "-Wextra",
+        "-Wno-deprecated-declarations",
         "-Wno-unused-parameter",
         "-Wno-unused-variable",
     ],