soc: bcm: brcmstb: remove unused variable 'brcmstb_machine_match'

Fix the following clang warning:

drivers/soc/bcm/brcmstb/common.c:17:34: warning: unused variable
'brcmstb_machine_match' [-Wunused-const-variable].
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

drivers/soc/bcm/brcmstb/common.c

@@ -14,11 +14,6 @@
 static u32 family_id;
 static u32 product_id;
 
-static const struct of_device_id brcmstb_machine_match[] = {
-	{ .compatible = "brcm,brcmstb", },
-	{ }
-};
-
 u32 brcmstb_get_family_id(void)
 {
 	return family_id;