Allow correct interpretation of ANDROID_ACTIVE_PARTITION

Change 2/2 to allow hnvram to properly read ANDROID_ACTIVE_PARTITION.
This specifies the interpretation of ANDROID_ACTIVE_PARTITION.

Change-Id: Ie7ed3859c62f7c81aad38ca28f4208e72b813dd5
diff --git a/hnvram/hnvram_main.c b/hnvram/hnvram_main.c
index eb0f306..1148bb0 100644
--- a/hnvram/hnvram_main.c
+++ b/hnvram/hnvram_main.c
@@ -92,6 +92,8 @@
   {"MAC_ADDR_PON",         NVRAM_FIELD_MAC_ADDR_PON,      HNVRAM_MAC},
   {"PRODUCTION_UNIT",      NVRAM_FIELD_PRODUCTION_UNIT,   HNVRAM_STRING},
   {"BOOT_TARGET",          NVRAM_FIELD_BOOT_TARGET,       HNVRAM_STRING},
+  {"ANDROID_ACTIVE_PARTITION", NVRAM_FIELD_ANDROID_ACTIVE_PARTITION,
+   HNVRAM_STRING},
 };
 
 const hnvram_field_t* get_nvram_field(const char* name) {