nb/intel/i945: Remove redundant use of ACPI offset operator

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: Ie1f2a2ace335af7984209c9e286b9f85e5342a7e
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/31671
Reviewed-by: Lijian Zhao <lijian.zhao@intel.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/northbridge/intel/i945/acpi/hostbridge.asl b/src/northbridge/intel/i945/acpi/hostbridge.asl
index 7b3917d..8318773 100644
--- a/src/northbridge/intel/i945/acpi/hostbridge.asl
+++ b/src/northbridge/intel/i945/acpi/hostbridge.asl
@@ -34,18 +34,18 @@
 		,	11,	//
 		EPBR,	20,	// EPBAR
 
-		Offset (0x44),	// MCHBAR
+		// MCHBAR
 		MHEN,	 1,	// Enable
 		,	13,	//
 		MHBR,	18,	// MCHBAR
 
-		Offset (0x48),	// PCIe BAR
+		// PCIe BAR
 		PXEN,	 1,	// Enable
 		PXSZ,	 2,	// BAR size
 		,	23,	//
 		PXBR,	 6,	// PCIe BAR
 
-		Offset (0x4c),	// DMIBAR
+		// DMIBAR
 		DMEN,	 1,	// Enable
 		,	11,	//
 		DMBR,	20,	// DMIBAR
@@ -56,32 +56,32 @@
 		,	 4,
 		PM0H,	 2,
 		,	 2,
-		Offset (0x91),	// PAM1
+		// PAM1
 		PM1L,	 2,
 		,	 2,
 		PM1H,	 2,
 		,	 2,
-		Offset (0x92),	// PAM2
+		// PAM2
 		PM2L,	 2,
 		,	 2,
 		PM2H,	 2,
 		,	 2,
-		Offset (0x93),	// PAM3
+		// PAM3
 		PM3L,	 2,
 		,	 2,
 		PM3H,	 2,
 		,	 2,
-		Offset (0x94),	// PAM4
+		// PAM4
 		PM4L,	 2,
 		,	 2,
 		PM4H,	 2,
 		,	 2,
-		Offset (0x95),	// PAM5
+		// PAM5
 		PM5L,	 2,
 		,	 2,
 		PM5H,	 2,
 		,	 2,
-		Offset (0x96),	// PAM6
+		// PAM6
 		PM6L,	 2,
 		,	 2,
 		PM6H,	 2,