rockchip: rk3399: Fix enabling boot-on regulators

rockchip: rk3399: Fix enabling boot-on regulators

The new common rockchip pinctrl driver does not support explicit
requests for a particular pinctrl function.  As a result, the
board_init() function bails out early before enabling the boot-on
regulators.  Fix this by simply removing the request for pwm0, pwm2
and pwm3.  The generic DM code already does the necessary
configuration if necessary.

Reported-by: Levin Du <djw@t-chip.com.cn>
Signed-of-by: Mark Kettenis <kettenis@openbsd.org>