nvme: fabrics drivers don't need the nvme-pci driver

So select the NVME_CORE symbol instead of depending on BLK_DEV_NVME.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jay Freyensee <james_p_freyensee@linux.intel.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>

drivers/nvme/host/Kconfig

@@ -31,7 +31,7 @@ config NVME_FABRICS
 config NVME_RDMA
 	tristate "NVM Express over Fabrics RDMA host driver"
 	depends on INFINIBAND
-	depends on BLK_DEV_NVME
+	select NVME_CORE
 	select NVME_FABRICS
 	select SG_POOL
 	help

drivers/nvme/target/Kconfig

@@ -15,8 +15,8 @@ config NVME_TARGET
 
 config NVME_TARGET_LOOP
 	tristate "NVMe loopback device support"
-	depends on BLK_DEV_NVME
 	depends on NVME_TARGET
+	select NVME_CORE
 	select NVME_FABRICS
 	select SG_POOL
 	help