target: reshuffle headers

Create a new headers, drivers/target/target_core_internal.h that is supposed
to hold all target_core-internal prototypes.  Move all non-exported includes
from include/target to it, and merge the smaller prototype-only includes
inside drivers/target into it as well.  Mark functions that were found to
not be called outside their implementation file static.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
index 95dee70..36fa9a5 100644
--- a/drivers/target/target_core_pr.c
+++ b/drivers/target/target_core_pr.c
@@ -40,7 +40,7 @@
 #include <target/target_core_fabric_ops.h>
 #include <target/target_core_configfs.h>
 
-#include "target_core_hba.h"
+#include "target_core_internal.h"
 #include "target_core_pr.h"
 #include "target_core_ua.h"