[rstmgr] Correctly handle non-always-on por_ni - fixes #10682 - The fix in #8010 was incomplete. The non-always-on por_ni was fed in to rstmgr, however the non-always-on lc_src_rst did not take effect based on por_ni asserting. - This fix uses the internal por reset directly as the parent reset for lc/sys reset nodes. This ensures that if the external por_n_i drops for any reason, even if clocks are killed, the internal nodes are all reset as well. Signed-off-by: Timothy Chen <timothytim@google.com>
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