tree: Replace ShiftLeft(a,b,c) with ASL 2.0 syntax

Replace `ShiftLeft (a, b, c)` with `c = a << b`.

Change-Id: Ibd25a05f49f79e80592482a1b0532334f727af58
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70841
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/ec/lenovo/h8/acpi/thinkpad.asl

@@ -51,7 +51,7 @@ Device (HKEY)
 
 	/* Report event  */
 	Method (RHK, 1, NotSerialized) {
-		ShiftLeft (One, Arg0 - 1, Local0)
+		Local0 = One << (Arg0 - 1)
 		If (EMSK & Local0) {
 			BTN = Arg0
 			Notify (HKEY, 0x80)
@@ -60,7 +60,7 @@ Device (HKEY)
 
 	/* Report tablet  */
 	Method (RTAB, 1, NotSerialized) {
-		ShiftLeft (One, Arg0 - 1, Local0)
+		Local0 = One << (Arg0 - 1)
 		If (ETAB & Local0) {
 			BTAB = Arg0
 			Notify (HKEY, 0x80)
@@ -84,7 +84,7 @@ Device (HKEY)
 	/* Enable/disable event.  */
 	Method (MHKM, 2, NotSerialized) {
 		If (Arg0 <= 0x20) {
-			ShiftLeft (One, Arg0 - 1, Local0)
+			Local0 = One << (Arg0 - 1)
 			If (Arg1)
 			{
 				Or (DHKN, Local0, DHKN)

src/ec/smsc/mec1308/acpi/battery.asl

@@ -60,7 +60,7 @@ Device (BAT0)
 	Method (SWAB, 1, NotSerialized)
 	{
 		Local0 = Arg0 >> 8
-		ShiftLeft (Arg0, 8, Local1)
+		Local1 = Arg0 << 8
 		And (Local1, 0xFF00, Local1)
 		Or (Local0, Local1, Local0)
 		If (Local0 == 0xFFFF) {