src: Remove redundant use of ACPI offset(0)

IASL version 20180927 and greater, detects Unnecessary/redundant uses of
the Offset() operator within a Field Unit list.
It then sends a remark "^ Unnecessary/redundant use of Offset"

example:
    OperationRegion (OPR1, SystemMemory, 0x100, 0x100)
    Field (OPR1)
    {
        Offset (0),     // Never needed
        FLD1, 32,
        Offset (4),     // Redundant, offset is already 4 (bytes)
        FLD2, 8,
        Offset (64),    // OK use of Offset.
        FLD3, 16,
    }

We will have those remarks:
dsdt.asl     14:         Offset (0),
Remark   2158 -                 ^ Unnecessary/redundant use of Offset operator

dsdt.asl     16:         Offset (4),
Remark   2158 -                 ^ Unnecessary/redundant use of Offset operator

Change-Id: I260a79ef77025b4befbccc21f5999f89d90c1154
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43283
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-by: Jason Glenesk <jason.glenesk@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/facebook/monolith/acpi/ec.asl

@@ -29,7 +29,6 @@ Device (EC0)
 	OperationRegion (ERAM, EmbeddedControl, 0x00, 0xFF)
 	Field (ERAM, ByteAcc, NoLock, Preserve)
 	{
-		Offset (0x00),
 		CPUT,   8,
 	}
 

src/mainboard/lenovo/s230u/acpi/ec.asl

@@ -12,7 +12,6 @@ Device (EC0)
 	OperationRegion (ERAM, SystemMemory, (CONFIG_EC_BASE_ADDRESS + 0x100), 0x100)
 	Field (ERAM, ByteAcc, Lock, Preserve)
 	{
-		Offset(0x00),
 		    ,   1,
 		    ,   1,
 		HKFA,   1,  // FN lock (Hotkey / FN row toggle)

src/mainboard/lippert/frontrunner-af/dsdt.asl

@@ -134,8 +134,7 @@ DefinitionBlock (
 		PIOD, 0x00000008,
 	}
 	IndexField (PIOI, PIOD, ByteAcc, NoLock, Preserve) {
-		Offset(0x00),	/* MiscControl */
-		, 1,
+		    , 1,	/* MiscControl */
 		T1EE, 1,
 		T2EE, 1,
 		Offset(0x01),	/* MiscStatus */