Add imxrt1180 feature and pads

[nilfit]

Derived from the 1189 CM33 SVD. The pad definitions are exactly the same in the CM7 SVD; confirmed by diffing the iomuxc output for the CM33- and CM7-based outputs.

This covers 175 of the 190 pins mentioned in the Pin Assignments table of chapter 13 External Signals and Pin Multiplexing. The 15 that are missing are the 10 GPIO_BBSM_* pins and a few others (POR_B, ONOFF, ...), none of which have alternate modes.

[korken89]

Only small typo, else LGTM. Thoughts @mciantyre ?

[mciantyre]

I fixed up the typos in my remote, in case you'd like to force push that commit into your branch.

Looks like a good start. I made sure we didn't have excessive number of GPIOs with offsets 0 or 1, like the defect that #44 fixed.

It looks like #28 applies to the 1180. I updated the issue title.