hvp vplan creation and sanity covergroup implementation

Created by: AnouarZajni

1- cva6.hvp vplan creation in sim directory including sanity features, mapped all existing covergroups for functional features and code coverage 2- modifier_embedded.hvp creation in sim directory used to filter out hvp for embedded config 3- Implementation of all needed sanity covergroups: RTL Configuration + Hard Reset + Boot Address + clock period 4- Implementation of passive RAL for CSR coverage