soc: bcm: brcmstb: Remove soc_is_brcmstb()

We have no in tree or out of tree users of this function, remove it and
the header providing its prototype.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

drivers/soc/bcm/brcmstb/common.c

@@ -11,8 +11,6 @@
 #include <linux/soc/brcmstb/brcmstb.h>
 #include <linux/sys_soc.h>
 
-#include <soc/brcmstb/common.h>
-
 static u32 family_id;
 static u32 product_id;
 
@@ -21,21 +19,6 @@ static const struct of_device_id brcmstb_machine_match[] = {
 	{ }
 };
 
-bool soc_is_brcmstb(void)
-{
-	const struct of_device_id *match;
-	struct device_node *root;
-
-	root = of_find_node_by_path("/");
-	if (!root)
-		return false;
-
-	match = of_match_node(brcmstb_machine_match, root);
-	of_node_put(root);
-
-	return match != NULL;
-}
-
 u32 brcmstb_get_family_id(void)
 {
 	return family_id;

include/soc/brcmstb/common.h

-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright © 2014 NVIDIA Corporation
- * Copyright © 2015 Broadcom Corporation
- */
-
-#ifndef __SOC_BRCMSTB_COMMON_H__
-#define __SOC_BRCMSTB_COMMON_H__
-
-bool soc_is_brcmstb(void);
-
-#endif /* __SOC_BRCMSTB_COMMON_H__ */