pwm.c: Must write period before duty_cycle to avoid sysfs error

Signed-off-by: Henry Bruce <henry.bruce@intel.com>
intel_minnow_max.c: Set pwm controller and channel values

Signed-off-by: Henry Bruce <henry.bruce@intel.com>
cmake: Updated toolchain config so that 'make install' targets oe sysroot

Signed-off-by: Henry Bruce <henry.bruce@intel.com>