acpi/tests/avocado/bits: disable acpi PSS tests that are failing in biosbits

acpi/tests/avocado/bits: disable acpi PSS tests that are failing in biosbits

PSS tests in acpi test suite seems to be failing in biosbits. This is because
the test is unable to find PSS support in QEMU bios. Let us disable
them for now so that make check does not fail. We can fix the tests and
re-enable them later.

Example failure:

---- ACPI _PSS (Pstate) table conformance tests ----
[assert] _PSS must exist FAIL
  \_SB_.CPUS.C000
  No _PSS exists
Summary: 1 passed, 1 failed
---- ACPI _PSS (Pstate) runtime tests ----
[assert] _PSS must exist FAIL
  \_SB_.CPUS.C000
  No _PSS exists
Summary: 0 passed, 1 failed

Cc: Daniel P. Berrangé <berrange@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Maydell Peter <peter.maydell@linaro.org>
Cc: John Snow <jsnow@redhat.com>
Cc: Thomas Huth <thuth@redhat.com>
Cc: Alex Bennée <alex.bennee@linaro.org>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Michael Tsirkin <mst@redhat.com>
Signed-off-by: Ani Sinha <ani@anisinha.ca>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20221021095108.104843-4-ani@anisinha.ca>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>