tests: acpi: make acpi_fetch_table() take size of fetched table pointer

tests: acpi: make acpi_fetch_table() take size of fetched table pointer

Currently acpi_fetch_table() assumes 32 bit size of table pointer
in ACPI tables. However X_foo variants are 64 bit, prepare
acpi_fetch_table() to handle both by adding an argument
for addr_ptr pointed entry size. Follow up commits will use that
to read XSDT and X_foo entries in ACPI tables.

Signed-off-by: Igor Mammedov <[email protected]>
Message-Id: <1556808723[email protected]>
Reviewed-by: Wei Yang <[email protected]>
Reviewed-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>