This patch corrects a bug reported by Peter Vasil.

When all PWMs are disabled, PWM module may be disabled during
calls to pwm_config. This patch enables/disables the clock in
pwm_config to ensure the module is active before register read/
writes.
Signed-off-by: NTony Prisk <linux@prisktech.co.nz>
Tested-by: NPeter Vasil <petervasil@gmail.com>
Signed-off-by: NThierry Reding <thierry.reding@avionic-design.de>