Cv32e40x/merge rel to dev 15

Created by: silabs-robin

Merge procedure "rel->dev" 40x.

Passes "rel_check" w/ Xcelium, except for the 4 failures below.

There are known failures: cv32e40x_csr_access_test, corev_rand_debug_ebreak (both fail in "full" regression on "dev" already). debug_test, corev_rand_interrupt_debug (both fail on the known debug_assert problem). @silabs-hfegran , @silabs-mateilga , I want to point out the known failures above, so you are aware (and in case you want to object to the merge).