nvme: Have NVME_FABRICS select NVME_CORE instead of transport drivers

Transport drivers need both core and fabrics modules, instead of
selecting both, have the selection transitive such that NVME_FABRICS
selects NVME_CORE and transport drivers select NVME_FABRICS.
Suggested-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Reviewed-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/nvme/host/Kconfig

@@ -33,12 +33,12 @@ config NVME_HWMON
 	  in the system.
 
 config NVME_FABRICS
+	select NVME_CORE
 	tristate
 
 config NVME_RDMA
 	tristate "NVM Express over Fabrics RDMA host driver"
 	depends on INFINIBAND && INFINIBAND_ADDR_TRANS && BLOCK
-	select NVME_CORE
 	select NVME_FABRICS
 	select SG_POOL
 	help
@@ -55,7 +55,6 @@ config NVME_FC
 	tristate "NVM Express over Fabrics FC host driver"
 	depends on BLOCK
 	depends on HAS_DMA
-	select NVME_CORE
 	select NVME_FABRICS
 	select SG_POOL
 	help
@@ -72,7 +71,6 @@ config NVME_TCP
 	tristate "NVM Express over Fabrics TCP host driver"
 	depends on INET
 	depends on BLOCK
-	select NVME_CORE
 	select NVME_FABRICS
 	select CRYPTO
 	select CRYPTO_CRC32C

drivers/nvme/target/Kconfig

@@ -31,7 +31,6 @@ config NVME_TARGET_PASSTHRU
 config NVME_TARGET_LOOP
 	tristate "NVMe loopback device support"
 	depends on NVME_TARGET
-	select NVME_CORE
 	select NVME_FABRICS
 	select SG_POOL
 	help
@@ -65,7 +64,6 @@ config NVME_TARGET_FC
 config NVME_TARGET_FCLOOP
 	tristate "NVMe over Fabrics FC Transport Loopback Test driver"
 	depends on NVME_TARGET
-	select NVME_CORE
 	select NVME_FABRICS
 	select SG_POOL
 	depends on NVME_FC