fix: sync uart and flash for wba

[andjordan]

• Fix UART interrupt not being enabled
• Fix write to flash for larger payloads
• Remove duplicated code

wip: Flash erase

[github-actions]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
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✅ REPOSITORY	trivy-sbom	yes		no	0.11s
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⚠️ SPELL	lychee	32		2	51.14s
✅ YAML	prettier	9	1	0	1.99s
✅ YAML	v8r	9		0	6.46s
✅ YAML	yamllint	9		0	0.27s

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