bl30: add pwm support [2/2]

PD#SWPL-81351

Problem:
it does not support pwm

Solution:
support pwm

Verify:
s5_pxp code prepare

Change-Id: Idc2aa1ca7c7edfb12648554c891f5bac55c8f03a
Signed-off-by: junyi.zhao <junyi.zhao@amlogic.com>
1 file changed