greybus: rename "gpbridge.h"

The file "gpbridge.h" is now used as a single place to define
all protocol message structures.  These protocols are not
necessarily related to the GP bridge, so the name of the
file is misleading.

Rename it "greybus_protocols.h".
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/greybus.h

@@ -23,7 +23,7 @@
 #include "kernel_ver.h"
 #include "greybus_id.h"
 #include "greybus_manifest.h"
-#include "gpbridge.h"
+#include "greybus_protocols.h"
 #include "manifest.h"
 #include "endo.h"
 #include "module.h"