variant(H5): add generic H503RB and Nucelo H503RB#20

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fpistm wants to merge 3 commits intomainfrom

feat-nucleo-h503rb

Commits on Aug 29, 2023

variant(H5): add generic generic H503RBTx support

dojyorin
and
fpistm
committed

Commits on Aug 30, 2023