[pwrmgr] Fix DC compilation issue and verible style warnings
[pwrmgr] Fix DC compilation issue and verible style warnings

Signed-off-by: Michael Schaffner <a005a2d3342a687ea2d05360c953107acbe83e08@google.com>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan