pwm: Changes for v4.9-rc1

This set of changes contains support for PWM signal capture in the STi
driver as well as support for the PWM controller found on Meson SoCs.
There's also support added for the MediaTek MT2701 and SunXi H3 to the
existing drivers.

Other than that there's a fair set of miscellaneous cleanups and fixes
across the board.
Merge branch 'for-4.9/drivers' into for-next