binderfs: make symbol 'binderfs_fs_parameters' static

The sparse tool complains as follows:

drivers/android/binderfs.c:66:32: warning:
 symbol 'binderfs_fs_parameters' was not declared. Should it be static?

This variable is not used outside of binderfs.c, so this commit
marks it static.

Fixes: 095cf502 ("binderfs: port to new mount api")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Link: https://lore.kernel.org/r/20200818112245.43891-1-weiyongjun1@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/android/binderfs.c

@@ -63,7 +63,7 @@ static const struct constant_table binderfs_param_stats[] = {
 	{}
 };
 
-const struct fs_parameter_spec binderfs_fs_parameters[] = {
+static const struct fs_parameter_spec binderfs_fs_parameters[] = {
 	fsparam_u32("max",	Opt_max),
 	fsparam_enum("stats",	Opt_stats_mode, binderfs_param_stats),
 	{}