Set bits per sample for FLAC and WAV

Set bits per sample in FLAC/WAV Extractors to be used in
metadataretriever.

Bug: 112986969
Test: Check if bits per sample can be retrieved from FLAC

Change-Id: I87f917c3bba9a7a852010355cadfb7247c5375f6
diff --git a/media/ndk/NdkMediaFormat.cpp b/media/ndk/NdkMediaFormat.cpp
index 22fbb42..99820c1 100644
--- a/media/ndk/NdkMediaFormat.cpp
+++ b/media/ndk/NdkMediaFormat.cpp
@@ -276,6 +276,7 @@
 EXPORT const char* AMEDIAFORMAT_KEY_AUTHOR = "author";
 EXPORT const char* AMEDIAFORMAT_KEY_BITRATE_MODE = "bitrate-mode";
 EXPORT const char* AMEDIAFORMAT_KEY_BIT_RATE = "bitrate";
+EXPORT const char* AMEDIAFORMAT_KEY_BITS_PER_SAMPLE = "bits-per-sample";
 EXPORT const char* AMEDIAFORMAT_KEY_CAPTURE_RATE = "capture-rate";
 EXPORT const char* AMEDIAFORMAT_KEY_CDTRACKNUMBER = "cdtracknum";
 EXPORT const char* AMEDIAFORMAT_KEY_CHANNEL_COUNT = "channel-count";