Add a new driver for the ARM CLPS711X Pulse Width Modulator (PWM) interface.
This CPU contain two 4-bit PWM outputs with constant period, based on CPU
PLL frequency. PWM polarity is determined by hardware by power on reset.
Signed-off-by: NAlexander Shiyan <shc_work@mail.ru>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>