Allowlist sdkextensions proto lib

This is safe for apex use.

Bug: 173188089
Test: m apex-allowed-deps-check
Merged-In: Ib4a69d93843d4e3b44073c79e704c5fc1635c1ad
Change-Id: Ib4a69d93843d4e3b44073c79e704c5fc1635c1ad
diff --git a/apex/allowed_deps.txt b/apex/allowed_deps.txt
index 69bf64f..adea9f0 100644
--- a/apex/allowed_deps.txt
+++ b/apex/allowed_deps.txt
@@ -384,6 +384,7 @@
 libring(minSdkVersion:29)
 libring-core(minSdkVersion:29)
 librustc_demangle.rust_sysroot(minSdkVersion:29)
+libsdk_proto(minSdkVersion:30)
 libsfplugin_ccodec_utils(minSdkVersion:29)
 libsonivoxwithoutjet(minSdkVersion:29)
 libspeexresampler(minSdkVersion:29)