[project] Don't use mini IRP handling for IRP_MJ_POWER

[project] Don't use mini IRP handling for IRP_MJ_POWER

Instead of using the mini IRP handling logic, we will
handle IRP_MJ_POWER differently.  This might be a trend...

Also introduced are:

driver__complete_irp() for common IRP completion logic.

device__dispatch_func typedef for IRP dispatch routines.

device::irp_mj is an pointer to an IRP handling table based
on major function code.