packages/apps/SoundRecorder: Set LOCAL_SDK_VERSION where possible.

This change sets LOCAL_SDK_VERSION for all packages where
this is possible without breaking the build, and
LOCAL_PRIVATE_PLATFORM_APIS := true otherwise.

Setting one of these two will be made required soon, and this
is a change in preparation for that. Not setting LOCAL_SDK_VERSION
makes the app implicitly depend on the bootclasspath, which is
often not required. This change effectively makes depending on
private apis opt-in rather than opt-out.

Test: make relevant packages
Bug: 73535841
Change-Id: I5a7eeb510ef5dfff4591be715beda17c7c1b0e9a
diff --git a/Android.mk b/Android.mk
index 51eba9e..0154231 100644
--- a/Android.mk
+++ b/Android.mk
@@ -6,5 +6,6 @@
 LOCAL_SRC_FILES := $(call all-subdir-java-files)
 
 LOCAL_PACKAGE_NAME := SoundRecorder
+LOCAL_SDK_VERSION := current
 
 include $(BUILD_PACKAGE)