Pass min_sdk_version to cc __ANDROID_SDK_VERSION__

The macro is required only for apex variants regardless of useVndk.
Before the enforcement of LLNDK sdk version, the macro was not passed to
vendor variants.

Bug: 151689896
Test: TARGET_BUILD_APPS=com.android.media.swcodec m
      libbase in swcodec apex is linked with liblog#29
      (compiled with __ANDROID_SDK_VERSIO__=29)

Change-Id: I57fa4afe027eb39b98bd94d534be9ebe11713f19