MAINTAINERS: Update MELLANOX MLX4 core VPI driver maintainer

Add myself as a maintainer for mlx4 core driver,
replacing Yishai Hadas.

Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/MAINTAINERS b/MAINTAINERS
index 9e98464..d9d5398 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8508,7 +8508,7 @@
 F:	drivers/media/radio/radio-miropcm20*
 
 MELLANOX MLX4 core VPI driver
-M:	Yishai Hadas <yishaih@mellanox.com>
+M:	Tariq Toukan <tariqt@mellanox.com>
 L:	netdev@vger.kernel.org
 L:	linux-rdma@vger.kernel.org
 W:	http://www.mellanox.com