Merge S->X

Created by: silabs-robin

This PR merges S->X, thereby fixing the problem that the 40x was not runnable with the latest updates to the new ISS infrastructure. @silabs-mateilga, @eroom1966, @MikeOpenHWGroup , please review carefully to see if my porting makes sense.

Summary:

• Merged cv32e40s/dev directly into cv32e40x/dev
  • (Manually resolved merge conflicts)
• Copied (and renamed) 40s files into the 40x directory
  • Carefully picked relevant parts of the diff
  • (Ignored all non-iss-related changes)

Step-wise diffs (to ease the review):

• Merge s->x
  • https://github.com/silabs-robin/core-v-verif/compare/fix40xsim...silabs-robin:core-v-verif:fix40xsim_pull40sdev
• Port s->x
  • https://github.com/silabs-robin/core-v-verif/compare/fix40xsim_pull40sdev...silabs-robin:core-v-verif:fix40xsim_pull40sdev_copy40sdir
• Changes not included (this shows what I rejected when porting)
  • https://github.com/silabs-robin/core-v-verif/compare/fix40xsim_pull40sdev_copy40sdir...silabs-robin:core-v-verif:fix40xsim_pull40sdev_copy40sdir_omittedchanges

Test status:

• ci_check passes 13/16 tests
  • Fails in {debug_test, illegal, corev_rand_interrupt}.
  • (All fails seem related to the ISS/RTL disagreeing about tdata1 reset value)
• Fv, is still runable

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(ps. With so much code in common, we could be smarter about putting shared code in separate files to keep these diffs easier to merge/review.)

(ps. Yes, we hoped to only be focusing on the S, but design make changes on the X before merging to the S, so then we seem forced to maintain the cv32e40x/dev.)