OvmfPkg: _DIS and _SRS methods should have permanent effect

OvmfPkg: _DIS and _SRS methods should have permanent effect

Kill PDIS and PSRS as they are writing to copies of PIR[A-D], not PIR[A-D]
themselves. Use specialized _DIS and _SRS methods that access PIR[A-D]
directly.

(This should be solvable by passing RefOf (PIRA) etc to PDIS/PSRS, however
the RHEL-6.3 kernel AML parser seems to choke on it. The rules described
in ACPIspec5.0 Table 19-316 "Object Storing and Copying Rules" don't seem
to work:

    ACPI Error: Needed [Integer/String/Buffer], found [Reference]
    ffff88003ee02420 (20090903/exresop-422)

    ACPI Exception: AE_AML_OPERAND_TYPE, While resolving operands for
    [OpcodeName unavailable] (20090903/dswexec-445)

    ACPI Error (psparse-0537): Method parse/execution failed
    [\_SB_.PCI0.LPC_.PDIS] (Node ffff88003f638b50), AE_AML_OPERAND_TYPE

    ACPI Error (psparse-0537): Method parse/execution failed
    [\_SB_.PCI0.LPC_.LNKA._DIS] (Node ffff88003f638a10),
    AE_AML_OPERAND_TYPE

When changing the method too, so that it writes to DerefOf (Arg0) instead
of Arg0, ie. explicitly dereferencing rather than expecting the auto-deref
to work:

    ACPI Error: Needed type [Reference], found [RegionField]
    ffff88003f639858 (20090903/exresop-104)

    ACPI Exception: AE_AML_OPERAND_TYPE, While resolving operands for
    [OpcodeName unavailable] (20090903/dswexec-445)

    ACPI Error (psparse-0537): Method parse/execution failed
    [\_SB_.PCI0.LPC_.PDIS] (Node ffff88003f638b50), AE_AML_OPERAND_TYPE

    ACPI Error (psparse-0537): Method parse/execution failed
    [\_SB_.PCI0.LPC_.LNKA._DIS] (Node ffff88003f638a10),
    AE_AML_OPERAND_TYPE

In short, when passing a RefOf, it is recognized as a reference inside the
method but mistakenly refused. When trying to deref it explicitly with
DerefOf, then it's suddenly not recognized as a reference.)

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13621 6f19259b-4bc3-4df7-8a09-765794883524