xsm: refactor IO hooks/sysctl hooks

- The patch refactors the IO resource checks into the rangeset add/del
  code. This produces a much more architecture friendly implementation and
  ensures that HVM and paravirtualized guests are checked consistently.

- The patch removes the following hooks in support of the refactoring
  of the IO resource checks:
    - xsm_irq_permission
    - xsm_iomem_permission
    - xsm_ioport_permission

- The patch adds the following hooks in support of the refactoring of
  the IO resource checks:
    - xsm_add_range
    - xsm_remove_range

- These IO refactoring changes are transparent to any pre-existing
  Flask policies.

- The patch adds also adds hooks for sysctl functionality that was
  added since the last major XSM patch.  The following hooks were added:
    - xsm_set_target
    - xsm_debug_keys
    - xsm_getcpuinfo
    - xsm_availheap
    - xsm_firmware_info
    - xsm_acpi_sleep
    - xsm_change_freq
    - xsm_getidletime
    - xsm_sendtrigger
    - xsm_test_assign_device
    - xsm_assign_device
    - xsm_deassign_device
    - xsm_bind_pt_irq
    - xsm_pin_mem_cacheattr
    - xsm_ext_vcpucontext

Signed-off-by: George Coker <gscoker@alpha.ncsc.mil>

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