binderfs: make symbol 'binderfs_fs_parameters' static

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: 58fadee96ec3 ("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.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>