Set min_sdk_version to be part of mainline modules

Modules contributing mainline modules (APK/APEX) should set
min_sdk_version as well as apex_available.

For now setting min_sdk_version doesn't change build outputs.
But build-time checks will be added soon.

Bug: 152655956
Test: m
Change-Id: I87ce41ad18a7a39f2c6c41c5aec2d8338db3ec8d
diff --git a/libhidlmemory/Android.bp b/libhidlmemory/Android.bp
index 3ba408f..bafb3ef 100644
--- a/libhidlmemory/Android.bp
+++ b/libhidlmemory/Android.bp
@@ -42,12 +42,12 @@
     export_shared_lib_headers: [
         "android.hidl.memory@1.0",
         "android.hidl.memory.token@1.0",
-        "libhidlbase"
+        "libhidlbase",
     ],
 
     srcs: [
         "HidlMemoryToken.cpp",
-        "mapping.cpp"
+        "mapping.cpp",
     ],
 
     product_variables: {
@@ -55,4 +55,5 @@
             cflags: ["-DLIBHIDL_TARGET_DEBUGGABLE"],
         },
     },
+    min_sdk_version: "29",
 }