vdpa: move to drivers/vdpa

We have both vhost and virtio drivers that depend on vdpa.
It's easier to locate it at a top level directory otherwise
we run into issues e.g. if vhost is built-in but virtio
is modular.  Let's just move it up a level.
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

MAINTAINERS

@@ -17695,6 +17695,7 @@ L:	virtualization@lists.linux-foundation.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/virtio/
 F:	drivers/virtio/
+F:	drivers/vdpa/
 F:	tools/virtio/
 F:	drivers/net/virtio_net.c
 F:	drivers/block/virtio_blk.c

drivers/Kconfig

@@ -138,6 +138,8 @@ source "drivers/virt/Kconfig"
 
 source "drivers/virtio/Kconfig"
 
+source "drivers/vdpa/Kconfig"
+
 source "drivers/vhost/Kconfig"
 
 source "drivers/hv/Kconfig"

drivers/Makefile

@@ -42,6 +42,7 @@ obj-$(CONFIG_DMADEVICES)	+= dma/
 obj-y				+= soc/
 
 obj-$(CONFIG_VIRTIO)		+= virtio/
+obj-$(CONFIG_VDPA)		+= vdpa/
 obj-$(CONFIG_XEN)		+= xen/
 
 # regulators early, since some subsystems rely on them to initialize

drivers/virtio/Kconfig

@@ -109,5 +109,3 @@ config VIRTIO_MMIO_CMDLINE_DEVICES
 	 If unsure, say 'N'.
 
 endif # VIRTIO_MENU
-
-source "drivers/virtio/vdpa/Kconfig"

drivers/virtio/Makefile

@@ -7,4 +7,3 @@ virtio_pci-$(CONFIG_VIRTIO_PCI_LEGACY) += virtio_pci_legacy.o
 obj-$(CONFIG_VIRTIO_BALLOON) += virtio_balloon.o
 obj-$(CONFIG_VIRTIO_INPUT) += virtio_input.o
 obj-$(CONFIG_VIRTIO_VDPA) += virtio_vdpa.o
-obj-$(CONFIG_VDPA) += vdpa/