[X2] AMO dont set rvfi_mem_rmask

[silabs-krdosvik]

AMO dont set rvfi_mem_rmask

AMO operations do both loads and stores:

However, we see that the rvfi_mem_rmask is not set for AMOs:

The reason seems to be that rmask is only set if the lsu dont do a write:

(As mentioned AMOs do both writes and reads, so we should use another strategy set mem_rmask)

Component

Indicate the component in which you found a problem (and we will add the appropriate label):

Component:RTL: (https://github.com/openhwgroup/cv32e40x/blob/master/bhv/cv32e40x_rvfi.sv)
**Component:Doc **:(https://docs.openhwgroup.org/projects/cv32e40x-user-manual/en/latest/atomics.html)

Steps to Reproduce

Please provide:

1. git hash: c788954