sb/intel/common/acpi_pirq_gen.h: Fix conflicting types for 'is_slot_pin_assigned'

Found using 'Wenum-int-mismatch' (GCC-13: default with -Wall):
src/southbridge/intel/common/acpi_pirq_gen.c:69:6: error: conflicting types for 'is_slot_pin_assigned' due to enum/integer mismatch; have 'bool(const struct slot_pin_irq_map *, unsigned int,  unsigned int,  enum pci_pin)' {aka '_Bool(const struct slot_pin_irq_map *, unsigned int,  unsigned int,  enum pci_pin)'} [-Werror=enum-int-mismatch]
   69 | bool is_slot_pin_assigned(const struct slot_pin_irq_map *pin_irq_map,
      |      ^~~~~~~~~~~~~~~~~~~~
In file included from src/southbridge/intel/common/acpi_pirq_gen.c:8:
src/southbridge/intel/common/acpi_pirq_gen.h:91:6: note: previous declaration of 'is_slot_pin_assigned' with type 'bool(const struct slot_pin_irq_map *, unsigned int,  unsigned int,  unsigned int)' {aka '_Bool(const struct slot_pin_irq_map *, unsigned int,  unsigned int,  unsigned int)'}
   91 | bool is_slot_pin_assigned(const struct slot_pin_irq_map *pin_irq_map,
      |      ^~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

Change-Id: Ie91947d00feaae42314ec2d1291f39d667a85346
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70387
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <inforichland@gmail.com>

src/southbridge/intel/common/acpi_pirq_gen.h

@@ -89,6 +89,7 @@ void intel_write_pci0_PRT(const struct slot_pin_irq_map *pin_irq_map,
 			  const struct pic_pirq_map *pirq_map);
 
 bool is_slot_pin_assigned(const struct slot_pin_irq_map *pin_irq_map,
-			  unsigned int map_count, unsigned int slot, unsigned int pin);
+			  unsigned int map_count, unsigned int slot,
+			  enum pci_pin pin);
 
 #endif