PCI 16x50 UART Controller, O2 Enablement (#39)

* add PCI 16x50 uart controller, refactor the 16x50 structure

* refactor the pci detection mechanism, allow custom compatibility
  check logic.

* fix bug in pci device definition binding where only bind once

* refactor the 16x50 controller structure, move pmio and mmio
  as separated component and does not need to couple with interface

* fix issue where x86:isrm_ivexalloc alloc duplicated interrupt vector

* change the signature of ioremap to return ptr_t instead of generic
  pointer

* fix issue in LunaConfig header export, where non string type being
  joined as a string type

* add config term for 16x50 controller.

* rework the usr/testp, allow user to specify serial interface

* usr/ls, add a slash after directory file name to distinguish

* add the implementation for iounmap

* refactor pci dev to use latest change in pci

* remove the out-dated, mask based compatibility check scheme

* rectify the issues with -O2 optimization

* refactor: allow Lunaix to compile with -O2 optimization
* add LConfig terms for PCI related features
* add LConfig terms for AHCI related features
* refactor the pci device code base with latest pci refactoring
* fix: fail to read bool type config term when the value of the
       term is False
* refactor: LConfig: allow omit the `LConfig` when doing include

* remove legacy file