MAINTAINERS: Remove bouncing maintainer, Mika takes over DMA test driver

This maintainer's email is now bouncing. Since Mika maintains the core
Thunderbolt/USB4 driver he can take over this one too.

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
[mw: Put me as maintainer instead of orphaning it]
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Author: hansendc

MAINTAINERS

@@ -26300,7 +26300,7 @@ F:	drivers/media/i2c/thp7312.c
 F:	include/uapi/linux/thp7312.h
 
 THUNDERBOLT DMA TRAFFIC TEST DRIVER
-M:	Isaac Hazan <isaac.hazan@intel.com>
+M:	Mika Westerberg <westeri@kernel.org>
 L:	linux-usb@vger.kernel.org
 S:	Maintained
 F:	drivers/thunderbolt/dma_test.c