external: fix invalid KASAN SANITIZE
external: fix invalid KASAN SANITIZE

This patch fix build error issue due to invalid KASAN SANITIZE option in
the Makefile.

Change-Id: I3dc3b665ab94b9e5878cba1cbf0606dc0efd0c90
Signed-off-by: Inho Oh <0b7eecf73a7becb28d87bced5e45ac4ddb15b68d@samsung.com>

JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT,JunhwanPark/TizenRT