[third_party/sbc] Expose decoder headers in public config

Change-Id: I1e519aca034e3868a3e575a7b5b4a2c3856def65
diff --git a/embdrv/sbc/BUILD.gn b/embdrv/sbc/BUILD.gn
index a3449aa..204652f 100644
--- a/embdrv/sbc/BUILD.gn
+++ b/embdrv/sbc/BUILD.gn
@@ -14,6 +14,10 @@
 #  limitations under the License.
 #
 
+config("sbc_decoder_includes_config") {
+  include_dirs = [ "decoder/include" ]
+}
+
 source_set("sbc_decoder") {
   sources = [
     "decoder/srce/alloc.c",
@@ -32,9 +36,11 @@
     "decoder/srce/synthesis-sbc.c",
   ]
 
-  include_dirs = [ "decoder/include" ]
+  public_configs = [":sbc_decoder_includes_config"]
 }
 
+
+
 config("sbc_encoder_includes_config") {
   include_dirs = ["encoder/include"]
 }