bus: brcmstb_gisb: Allow building as module

Allow building the Broadcom STB GISB arbiter driver as a module, however
similar to interrupt controller drivers, don't allow its unbind/removal
since it is not quite prepared for that and we want it to catch bus
errors all the time.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

drivers/bus/Kconfig

@@ -30,7 +30,7 @@ config ARM_INTEGRATOR_LM
 	  found on the ARM Integrator AP (Application Platform)
 
 config BRCMSTB_GISB_ARB
-	bool "Broadcom STB GISB bus arbiter"
+	tristate "Broadcom STB GISB bus arbiter"
 	depends on ARM || ARM64 || MIPS
 	default ARCH_BRCMSTB || BMIPS_GENERIC
 	help

drivers/bus/brcmstb_gisb.c

 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (C) 2014-2017 Broadcom
+ * Copyright (C) 2014-2021 Broadcom
  */
 
 #include <linux/init.h>
@@ -536,6 +536,7 @@ static struct platform_driver brcmstb_gisb_arb_driver = {
 		.name	= "brcm-gisb-arb",
 		.of_match_table = brcmstb_gisb_arb_of_match,
 		.pm	= &brcmstb_gisb_arb_pm_ops,
+		.suppress_bind_attrs = true,
 	},
 };
 
@@ -546,3 +547,7 @@ static int __init brcm_gisb_driver_init(void)
 }
 
 module_init(brcm_gisb_driver_init);
+
+MODULE_AUTHOR("Broadcom");
+MODULE_DESCRIPTION("Broadcom STB GISB arbiter driver");
+MODULE_LICENSE("GPL v2");