ACPI: Define acpi_get_preferred_pm_profile()

Change-Id: I2e7f22ccccc6c0df8e7e9f354c50893a53a41714
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42140
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/include/acpi/acpi.h

@@ -1045,6 +1045,8 @@ static inline int acpi_sleep_from_pm1(uint32_t pm1_cnt)
 }
 #endif
 
+uint8_t acpi_get_preferred_pm_profile(void);
+
 /* Returns ACPI_Sx values. */
 int acpi_get_sleep_type(void);