IOMUX configuration fixes #636
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This PR:
iomux_configscript is used, it first generates the default configuration for all available IOMUXes according to default values for IOMUX configuration registers. Then it overlays the defaults with configuration for specific design and generates the final output.eos_s3_iomux_configtoiomux_configBecause the pads don't have all the same default configurations, some hardcoded mappings were introduced to handle that correctly.