Sweep: Remove x-hack from grub and nanopim4 scripts

[sweep-nightly[bot]]

• In packages/blobs/grub/09_linux_with_dtb.sh, identify all instances of the 'x-hack' and replace them with a more modern approach.
• In packages/bsp/nanopim4/nanopim4-pwm-fan.sh, identify all instances of the 'x-hack' and replace them with a more modern approach.
• Test the scripts to ensure they still work as expected after making the changes.

Parent issue: #11

Checklist

- [X] `packages/blobs/grub/09_linux_with_dtb.sh` ❌ Failed

• Search for all instances of 'x-hack' in the script. • Understand the purpose of each 'x-hack' and determine a suitable modern replacement. • Replace each 'x-hack' with the determined replacement. • Test the script to ensure it still functions as expected.

- [X] `packages/bsp/nanopim4/nanopim4-pwm-fan.sh` ❌ Failed

• Search for all instances of 'x-hack' in the script. • Understand the purpose of each 'x-hack' and determine a suitable modern replacement. • Replace each 'x-hack' with the determined replacement. • Test the script to ensure it still functions as expected.

[sweep-nightly[bot]]

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File Path	Proposed Changes
packages/blobs/grub/09_linux_with_dtb.sh	Modify packages/blobs/grub/09_linux_with_dtb.sh with contents: • Search for all instances of 'x-hack' in the script. • Understand the purpose of each 'x-hack' and determine a suitable modern replacement. • Replace each 'x-hack' with the determined replacement. • Test the script to ensure it still functions as expected.
packages/bsp/nanopim4/nanopim4-pwm-fan.sh	Modify packages/bsp/nanopim4/nanopim4-pwm-fan.sh with contents: • Search for all instances of 'x-hack' in the script. • Understand the purpose of each 'x-hack' and determine a suitable modern replacement. • Replace each 'x-hack' with the determined replacement. • Test the script to ensure it still functions as expected.

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