Remove residual blank line at start of MakefileThis is a residual of the $FreeBSD$ removal.MFC After: 3 days (though I'll just run the command on the branches)Sponsored by: Netflix
sys: Remove $FreeBSD$: one-line sh patternRemove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/
Rename rpi_pwm to bcm283x_pwm, and build it on armv[67] and arm64.Truncate ratio if period is lowered.Tested on Rpi2 and Rpi3.Rpi3 requires DTB->DTS->edit->DTB hack