hw/arm/acpi: simplify AML bit and/or statement

hw/arm/acpi: simplify AML bit and/or statement

The last argument of AML bit and/or statement is the target variable,
so we don't need to use a NULL target and then an additional store
operation; using just aml_and() or aml_or() statement is enough.

Also update tests/data/acpi/virt/DSDT* to pass "make check".

Cc: Shannon Zhao <[email protected]>
Cc: Peter Maydell <[email protected]>
Cc: "Michael S. Tsirkin" <[email protected]>
Cc: Igor Mammedov <[email protected]>
Suggested-by: Igor Mammedov <[email protected]>
Reviewed-by: Igor Mammedov <[email protected]>
Signed-off-by: Heyi Guo <[email protected]>
Message-id: 20191209063719[email protected]
Signed-off-by: Peter Maydell <[email protected]>