soc/intel/cannonlake/acpi: Replace Add(a,b,c) with ASL 2.0 syntax

Replace `Add (a, b, c)` with `c = a + b`.

Change-Id: Ibc5aeb5e8d85556d7564033ec92deb5b2dae093d
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60486
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>

src/soc/intel/cannonlake/acpi/gpio.asl

@@ -91,7 +91,7 @@ Method (GADD, 1, NotSerialized)
 		Local1 = Arg0 - GPP_C0
 	}
 	Store (PCRB (Local0), Local2)
-	Add (Local2, PAD_CFG_BASE, Local2)
+	Local2 += PAD_CFG_BASE
 	Return (Add (Local2, Multiply (Local1, 16)))
 }
 

src/soc/intel/cannonlake/acpi/gpio_cnp_h.asl

@@ -91,6 +91,6 @@ Method (GADD, 1, NotSerialized)
 		Local1 = Arg0 - GPP_I0
 	}
 	Store (PCRB (Local0), Local2)
-	Add (Local2, PAD_CFG_BASE, Local2)
+	Local2 += PAD_CFG_BASE
 	Return (Add (Local2, Multiply (Local1, 16)))
 }