[rom_ctrl, dv] Assertion to check that pwrmgr_data_o.good is stable
[rom_ctrl, dv] Assertion to check that pwrmgr_data_o.good is stable

This assertion checks that pwrmgr_data_o.good is stable when
kmac_data_o.valid or keymgr_data_o.valid is asserted.

Signed-off-by: Prajwala Puttappa <d42da9c1e7c0c7ddf8c0244ff16e57febc9395a0@lowrisc.org>

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