Bluetooth: Classic: shell: Add cover art shell commands

Add cover art shell commands for AVRCP controller and target.

Signed-off-by: Lyle Zhu <lyle.zhu@nxp.com>

Author: lylezhu2012

subsys/bluetooth/host/classic/shell/CMakeLists.txt

@@ -13,3 +13,6 @@ endif()
 
 zephyr_library_sources_ifdef(CONFIG_BT_GOEP goep.c)
 zephyr_library_sources_ifdef(CONFIG_BT_BIP bip.c)
+if(CONFIG_BT_AVRCP_TG_COVER_ART OR CONFIG_BT_AVRCP_CT_COVER_ART)
+  zephyr_library_sources(avrcp_cover_art.c)
+endif()