[Armbian build PR] - Set fixed MAC address for Nanaopi R6S series

[RSS Bot]

Description

Apply small fixes to MAC setting routine, address some shell check stuff.

How Has This Been Tested?

• [x] Executed script created YAML configs, reboot succeeded, vendor kernel 6.1.y

Checklist:

• [x] My changes generate no new warnings
• [x] Any dependent changes have been merged and published in downstream modules

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