soc/intel/acpi: Replace Subtract(a,b) with ASL 2.0 syntax

Replace `Subtract (a, b)` with `a - b`.

Change-Id: I77028c17dcd7925a392d56488d34090837d660f2
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70626
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
diff --git a/src/soc/intel/baytrail/acpi/southcluster.asl b/src/soc/intel/baytrail/acpi/southcluster.asl
index 551bf08..61700bc 100644
--- a/src/soc/intel/baytrail/acpi/southcluster.asl
+++ b/src/soc/intel/baytrail/acpi/southcluster.asl
@@ -175,8 +175,8 @@
 
 	/* TOLM is BMBOUND accessible from IOSF so is saved in NVS */
 	Store (\TOLM, PMIN)
-	Store (Subtract(CONFIG_ECAM_MMCONF_BASE_ADDRESS, 1), PMAX)
-	PLEN = Subtract (PMAX, PMIN) + 1
+	Store (CONFIG_ECAM_MMCONF_BASE_ADDRESS - 1, PMAX)
+	PLEN = PMAX - PMIN + 1
 
 	Return (MCRS)
 }
diff --git a/src/soc/intel/braswell/acpi/lpc.asl b/src/soc/intel/braswell/acpi/lpc.asl
index 2b54018..fca8017 100644
--- a/src/soc/intel/braswell/acpi/lpc.asl
+++ b/src/soc/intel/braswell/acpi/lpc.asl
@@ -39,7 +39,7 @@
 			CreateDwordField (^RBUF, ^FBAR._LEN, FLEN)
 			Multiply(CONFIG_COREBOOT_ROMSIZE_KB, 1024, Local0)
 			Store(Local0, FLEN)
-			FBAS = Subtract(0xffffffff, Local0) + 1
+			FBAS = 0xffffffff - Local0 + 1
 			Return (^RBUF)
 		}
 	}
diff --git a/src/soc/intel/braswell/acpi/southcluster.asl b/src/soc/intel/braswell/acpi/southcluster.asl
index 0a4dbd1..ade6441 100644
--- a/src/soc/intel/braswell/acpi/southcluster.asl
+++ b/src/soc/intel/braswell/acpi/southcluster.asl
@@ -174,8 +174,8 @@
 
 	/* TOLM is BMBOUND accessible from IOSF so is saved in NVS */
 	Store (\TOLM, PMIN)
-	Store (Subtract(CONFIG_ECAM_MMCONF_BASE_ADDRESS, 1), PMAX)
-	PLEN = Subtract (PMAX, PMIN) + 1
+	Store (CONFIG_ECAM_MMCONF_BASE_ADDRESS - 1, PMAX)
+	PLEN = PMAX - PMIN + 1
 
 	Return (MCRS)
 }