ACPI: DPTF: Use ACPI_FREE() for ACPI buffer deallocation

Replace kfree() with ACPI_FREE() in pch_fivr_read() to follow ACPICA
memory management conventions.

While functionally equivalent in Linux (ACPI_FREE() is implemented
as kfree()), using ACPI_FREE() maintains consistency with ACPICA
coding standards for deallocating ACPI buffer objects.

Signed-off-by: Kaushlendra Kumar <[e-mail]>
[ rjw: Subject and changelog edits ]
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Rafael J. Wysocki <[e-mail]>

drivers/acpi/dptf/dptf_pch_fivr.c

···
 	ret = 0;
 
 release_buffer:
-	kfree(buffer.pointer);
+	ACPI_FREE(buffer.pointer);
 	return ret;
 }