[System RDL] Multibitbool on REGWEN.

[engdoreis]

The regwen maps to swwe in SystemRDL, however swwe it can only be one bit wide, which makes multibitbool ilegal for swwe in SystemRDL.

Blocks affected:

• DMA
• MBX

Possible solutions:

1. Create a custom property for multibitbool used on regwen:

 property mubi_swwe {
 type = MultiBitBool4;
 component = reg|field;
};