ACPI: mark acpi_sfi_table_parse() as __init

Mark function acpi_sfi_table_parse() as __init to avoid warning messages:

WARNING: vmlinux.o(.text+0x4cd2d2): Section mismatch in reference from the
function acpi_sfi_table_parse.clone.0() to the function

Function acpi_sfi_table_parse() calls acpi_table_parse() and
pci_parse_mcfg(), which are both marked as __init.  Currently
acpi_sfi_table_parse() is only used by MMCONFIG to scan MCFG table
at boot time only, so it's safe to mark acpi_sfi_table_parse() as __init.

Reviewed-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jiang Liu <liuj97@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>