examples: Update examples to use newer maa functions

* Use maa_init() before any other maa functions are called
* Use ioNN instead of gpioXX, Using mapping

Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>

examples/python/cycle-pwm3.py

@@ -25,6 +25,7 @@
 import pymaa as maa
 import time
 
+maa.maa_init()
 x = maa.PWM(0,3)
 x.enable(1);
 x.period_us(20)