media: MAINTAINERS: Fix email typo and correct name of Tianshu

Fix the typo in email address of Tianshu Qiu and correct the name.

Reported-by: Bjorn Helgaas <helgaas@kernel.org>
Signed-off-by: Tianshu Qiu <tian.shu.qiu@intel.com>
Signed-off-by: Bingbu Cao <bingbu.cao@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>