Add PWM modules into initramfs for armhf images

Kernel 5.7+ which we are using provides separate PWM modules pwm_imx27 and pwm_bl which doesn't included into initramfs. Adding modules above into initramfs allow to initialize LVDS display attached to SabreLite before Plymouth start. This fixes the splash screen for target images.

For now we haven't overlay for initramfs additional modules only for arm64 architecture, hence fix the overlay adding in ospack recipes.

Signed-off-by: Denis Pynkin denis.pynkin@collabora.com