PD#SWPL-57735

Problem:
close DEBUG_FS then clkmsr crash.

Solution:
adjust register debugfs

Verify:
g12a_u212

Change-Id: I7988c6d4a9508dad26a6f886289ec3509c0af1df
Signed-off-by: Bichao Zheng <bichao.zheng@amlogic.com>