FROMLIST: pwm: Convert period and duty cycle to u64

Because period and duty cycle are defined as ints with units of
nanoseconds, the maximum time duration that can be set is limited to
~2.147 seconds. Change their definitions to u64 in the structs of the
PWM framework so that higher durations may be set.

Also make the relevant fixes to those drivers that use the period and
duty_cycle struct members in division operations, viz. replacing the
division operations with 64-bit division macros as appropriate.

Bug: 140290586
Change-Id: Ibb8c7f007f4c11ebf8cf01e7a468cc9c29aa8b23
Link: https://www.spinics.net/lists/linux-pwm/msg11133.html


Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>
Reported-by: kbuild test robot <lkp@intel.com>