Adding min_sdk_version to libgrpc_bindgen

Bug: 206121418
Test: Compile
Change-Id: I939103023aa080ab695e44639880b01b78f2c4cc
diff --git a/Android.bp b/Android.bp
index 1256ee5..399a8c0 100644
--- a/Android.bp
+++ b/Android.bp
@@ -114,7 +114,8 @@
         "--blocklist-type=gpr_mu",
         "--blocklist-type=gpr_cv",
         "--blocklist-type=gpr_once",
-    ]
+    ],
+    min_sdk_version: "29",
 }
 
 rust_test {
diff --git a/patches/Android.bp.patch b/patches/Android.bp.patch
index 202a574..d97431f 100644
--- a/patches/Android.bp.patch
+++ b/patches/Android.bp.patch
@@ -14,7 +14,7 @@
      edition: "2018",
      features: [
          "bindgen",
-@@ -55,52 +55,74 @@
+@@ -55,52 +55,75 @@
          "liblibc",
          "liblibz_sys",
      ],
@@ -119,7 +119,8 @@
 +        "--blocklist-type=gpr_mu",
 +        "--blocklist-type=gpr_cv",
 +        "--blocklist-type=gpr_once",
-+    ]
++    ],
++    min_sdk_version: "29",
 +}
 +
 +rust_test {