lcd: support custom vx1 hw filter [1/1]

lcd: support custom vx1 hw filter [1/1]

PD#SWPL-8785

Problem:
fixed vx1 hw filter maybe cause some panel display normal

Solution:
add custom vx1 hw filter support
for panel ini:
if_attr_8=0x1 #vx1 hw filter period(0=default setting)
if_attr_9=0x0 #vx1 hw filter cnt(0=default setting)
for dts:
hw_filter = <0x1 0x0>; /* period(0=default), cnt(0=default) */

Verify:
x301

Change-Id: I4ce5f8fe4294331d6ec0026fa7736c6d3397c05e
Signed-off-by: Evoke Zhang <evoke.zhang@amlogic.com>