Add a new pwm app (fade led) using the new API.
Following the recent pwm RFC, all existing APIs will
be deprecated. Two new APIs will be added. The changes
for the new APIs and the required driver function have
been posted.
To demonstrate the usage of the new PWM APIs, this app
to fade led is added. It will use the new API pwm_pin_
set_usec().
This app will be located in a new sub directory.
Jira: ZEP-745 ZEP-1029
Change-Id: I8d929a21f7de88307c47b52f98f131e00b2fdbe7
Signed-off-by: Baohong Liu <baohong.liu@intel.com>