ACPI: platform: Use acpi_bus_get_primary_device()

The acpi_get_first_physical_node() usage in acpi_platform_fill_resource()
and acpi_create_platform_device() is generally unsafe because in theory
the device returned by it may be freed at any time [1].

It is also inefficient because acpi_get_first_physical_node() is called
multiple times for the same argument which can be avoided.

Address these issues by using acpi_bus_get_primary_device() instead of
acpi_get_first_physical_node() and adjusting the code to call it just
once at the beginning of and acpi_create_platform_device() and drop
the device reference acquired by it upon the return from that function.

Fixes: 3b95bd160547 ("ACPI: introduce a function to find the first physical device")
Fixes: a252d881c558 ("ACPI / platform: Pay attention to parent device's resources")
Link: https://sashiko.dev/#/patchset/12955541.O9o76ZdvQC%40rafael.j.wysocki [1]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/3436112.aeNJFYEL58@rafael.j.wysocki

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