* drop maxcpus=0, which was added with 73a033328e ("device-nokia-n900: set
uniprocessor mode for kernel (MR 4299)") while troubleshooting. a better
fix was eventually implemented with 3e737241ba ("linux-postmarketos-omap:
N900: disable twl off idle features (MR 4317)")
* drop PMOS_NO_OUTPUT_REDIRECT, which was obsoleted by 7c98127746
("postmarketos-initramfs: switch to udev and kmod (MR 5000)")