We update 'blink_led', 'fade_led' and 'rgb_led' to support dt generated
defines for the PWM info needed for each. Since hexiwear_k64 supports
generating the info, moved the support for hexiwear_k64 to just use the
dt generated defines.
For 'blink_led' and 'fade_led' we use an alias in dt called 'pwm-led0'.
For 'rgb_led' we use aliases 'red-pwm-led', 'green-pwm-led' and
'blue-pwm-led'
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
937f45dc86