external/avs: Use wildcard to replace find in Makfile
external/avs: Use wildcard to replace find in Makfile

There's such errors during make clean/distclean.
find: `./avs-device-sdk/ACL/src': No such file or directory
find: `./avs-device-sdk/ADSL/src': No such file or directory
find: `./avs-device-sdk/AFML/src': No such file or directory

davidfather/TizenRT,chanijjani/TizenRT,junmin-kim/TizenRT,HONGCHAEHEE/TizenRT,chanijjani/TizenRT,junmin-kim/TizenRT,sunghan-chang/TizenRT,davidfather/TizenRT,HONGCHAEHEE/TizenRT,jeongchanKim/TizenRT,sunghan-chang/TizenRT,HONGCHAEHEE/TizenRT,jeongchanKim/TizenRT,jeongchanKim/TizenRT,jsdosa/TizenRT,JeonginKim/TizenRT,HONGCHAEHEE/TizenRT,JeonginKim/TizenRT,jsdosa/TizenRT,jeongchanKim/TizenRT,sunghan-chang/TizenRT,jeongarmy/TizenRT,jsdosa/TizenRT,jeongchanKim/TizenRT,Samsung/TizenRT,JeonginKim/TizenRT,an4967/TizenRT,chanijjani/TizenRT,HONGCHAEHEE/TizenRT,an4967/TizenRT,jeongarmy/TizenRT,jeongchanKim/TizenRT,sunghan-chang/TizenRT,davidfather/TizenRT,an4967/TizenRT,junmin-kim/TizenRT,pillip8282/TizenRT,junmin-kim/TizenRT,pillip8282/TizenRT,Samsung/TizenRT,chanijjani/TizenRT,pillip8282/TizenRT,chanijjani/TizenRT,Samsung/TizenRT,davidfather/TizenRT,jsdosa/TizenRT,jsdosa/TizenRT,jeongarmy/TizenRT,davidfather/TizenRT,sunghan-chang/TizenRT,jeongarmy/TizenRT,jsdosa/TizenRT,junmin-kim/TizenRT,an4967/TizenRT,an4967/TizenRT,HONGCHAEHEE/TizenRT,sunghan-chang/TizenRT,Samsung/TizenRT,davidfather/TizenRT,Samsung/TizenRT,jeongchanKim/TizenRT,JeonginKim/TizenRT,pillip8282/TizenRT,JeonginKim/TizenRT,junmin-kim/TizenRT,JeonginKim/TizenRT,sunghan-chang/TizenRT,jeongarmy/TizenRT,pillip8282/TizenRT,davidfather/TizenRT,junmin-kim/TizenRT,jeongarmy/TizenRT,jeongarmy/TizenRT,Samsung/TizenRT,chanijjani/TizenRT,jsdosa/TizenRT,pillip8282/TizenRT,chanijjani/TizenRT,Samsung/TizenRT,pillip8282/TizenRT,an4967/TizenRT,an4967/TizenRT