Renesas RA4M1 SVD fails

[inferiorhumanorgans]

The Renesas RA4M1 SVD contains a few quirks that prevent chiptool from successfully generating code:

• Uses isDefault without value, which is currently unsupported. See Enums with isDefault not handled correctly #47, svd2ir: skip enum variants which are default values with no values #88.
• Uses dimIndex with duplicate register names See Chiptool chokes on registers with duplicate names and dimIindex #90, Handle non-numeric array indices for registers #92.
• Uses derivedFrom with registers, causing those registers to be skipped.
• Uses duplicate field names e.g. Reserved. See Permit duplicate "reserved" fields. #93.
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