NdkMediaFormat: add AMEDIAFORMAT_KEY_LOW_LATENCY

Test: cts
Bug: 134970151
Change-Id: Ib2cbc503096563db4b4a4e631697b913cc213cd0
diff --git a/media/ndk/NdkMediaFormat.cpp b/media/ndk/NdkMediaFormat.cpp
index 51138c8..ab0cb63 100644
--- a/media/ndk/NdkMediaFormat.cpp
+++ b/media/ndk/NdkMediaFormat.cpp
@@ -341,6 +341,7 @@
 EXPORT const char* AMEDIAFORMAT_KEY_LEVEL = "level";
 EXPORT const char* AMEDIAFORMAT_KEY_LOCATION = "location";
 EXPORT const char* AMEDIAFORMAT_KEY_LOOP = "loop";
+EXPORT const char* AMEDIAFORMAT_KEY_LOW_LATENCY = "low-latency";
 EXPORT const char* AMEDIAFORMAT_KEY_LYRICIST = "lyricist";
 EXPORT const char* AMEDIAFORMAT_KEY_MANUFACTURER = "manufacturer";
 EXPORT const char* AMEDIAFORMAT_KEY_MAX_BIT_RATE = "max-bitrate";