GPIO TIMERn syntax is not working on newer kernels

[pdp7]

As discovered in PR #152, TIMERn syntax is not working on newer kernels such as 4.4.

This is a valid path:
/sys/devices/platform/ocp/ocp:P8_10_pinmux/state

while this path is invalid:
/sys/devices/platform/ocp/ocp:TIMER_pinmux/state

[pdp7]

FYI - the test of GPIO.setup("TIMER6", GPIO.IN) was added to test/test_gpio_setup.py in 2013 (9903992).

[pdp7]

Upon further review, I'm going to close this as I don't believe there is any usage of the TIMERn key for GPIO pins and it would be odd for someone to prefer to a pin by that name in the context of GPIO.