derive_sdk: set min_sdk_version

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

Removed sdk_version because the sdk variant is not used by sdkext apex.
And, changed the dep from libbase_ndk to libbase. libbinder_ndk would
still work. But there's no reason to use it if not set sdk_version.

We could've set "sdk_variant_only" so that sdkext apex use the sdk
variant of derive_sdk explicitly. But even if we do that, we still have
to set min_sdk_version to be used by the apexes anyway.

Bug: 145796956
Test: m
Merged-In: I94ad8b9ffc5088822d3365253bf2f005a659d923
Change-Id: I94ad8b9ffc5088822d3365253bf2f005a659d923
(cherry picked from commit 4f49b2a289)

apex/sdkextensions/derive_sdk/Android.bp

@@ -22,12 +22,11 @@ cc_defaults {
         type: "lite",
         static: true,
     },
-    sdk_version: "current",
+    min_sdk_version: "current",
-    stl: "c++_static",
     shared_libs: ["liblog"],
-    static_libs: [
+    // static c++/libbase for smaller size
-        "libbase_ndk",
+    stl: "c++_static",
-    ],
+    static_libs: ["libbase"],
 }
 
 cc_binary {