Add PWM based generic tachometer which capture the pwm and report the speed. Bug 3621819 Change-Id: I08d7fc808c3a29d6876026ce539e3467887f8112 Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2703728 GVS: Gerrit_Virtual_Submit