MAINTAINERS: Remove Keith from VMD maintainer

I no longer work in this capacity on the VMD driver.
Signed-off-by: NKeith Busch <kbusch@kernel.org>
Signed-off-by: NLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: NJon Derrick <jonathan.derrick@intel.com>

MAINTAINERS

@@ -12442,7 +12442,6 @@ F:	Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
 F:	drivers/pci/controller/dwc/*imx6*
 
 PCI DRIVER FOR INTEL VOLUME MANAGEMENT DEVICE (VMD)
-M:	Keith Busch <keith.busch@intel.com>
 M:	Jonathan Derrick <jonathan.derrick@intel.com>
 L:	linux-pci@vger.kernel.org
 S:	Supported