Sweep: Remove x-hack from grub and nanopim4 scripts

[sweep-nightly[bot]]

• In packages/blobs/grub/09_linux_with_dtb.sh, replace all instances of the 'x-hack' with a more modern approach.
• In packages/bsp/nanopim4/nanopim4-pwm-fan.sh, replace all instances of the 'x-hack' with a more modern approach.

Parent issue: #11

[sweep-nightly[bot]]


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