[PATCH] MdePkg/PciExpress21.h: Fix typo in PCI_REG_PCIE_SLOT_CONTROL

[Ruiyu Ni <ruiyu.ni@intel.com>]

PCI_REG_PCIE_SLOT_CONTROL contains a typo. It is defined as:
typedef union {
  struct {
    UINT32 AttentionButtonPressed : 1;
    UINT32 ...
    ...
  } Bits;
  UINT16   Uint16;
} PCI_REG_PCIE_SLOT_CONTROL;

The bit field data type should be UINT16 instead of UINT32,
results sizeof (PCI_REG_PCIE_SLOT_CONTROL) equals to 4 instead of 2.

Because this structure is used in PCI_CAPABILITY_PCIEXP as below:
typedef struct {
  ...
  PCI_REG_PCIE_SLOT_CONTROL       SlotControl;
  PCI_REG_PCIE_SLOT_STATUS        SlotStatus;
} PCI_CAPABILITY_PCIEXP;

It cause the OFFSET_OF (PCI_CAPABILITY_PCIEXP, SlotStatus) equal
to a wrong value.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
---
 MdePkg/Include/IndustryStandard/PciExpress21.h | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/MdePkg/Include/IndustryStandard/PciExpress21.h b/MdePkg/Include/IndustryStandard/PciExpress21.h
index ce9c06a7c6..d90b5975ba 100644
--- a/MdePkg/Include/IndustryStandard/PciExpress21.h
+++ b/MdePkg/Include/IndustryStandard/PciExpress21.h
@@ -182,18 +182,18 @@ typedef union {
 
 typedef union {
   struct {
-    UINT32 AttentionButtonPressed : 1;
-    UINT32 PowerFaultDetected : 1;
-    UINT32 MrlSensorChanged : 1;
-    UINT32 PresenceDetectChanged : 1;
-    UINT32 CommandCompletedInterrupt : 1;
-    UINT32 HotPlugInterrupt : 1;
-    UINT32 AttentionIndicator : 2;
-    UINT32 PowerIndicator : 2;
-    UINT32 PowerController : 1;
-    UINT32 ElectromechanicalInterlock : 1;
-    UINT32 DataLinkLayerStateChanged : 1;
-    UINT32 Reserved : 3;
+    UINT16 AttentionButtonPressed : 1;
+    UINT16 PowerFaultDetected : 1;
+    UINT16 MrlSensorChanged : 1;
+    UINT16 PresenceDetectChanged : 1;
+    UINT16 CommandCompletedInterrupt : 1;
+    UINT16 HotPlugInterrupt : 1;
+    UINT16 AttentionIndicator : 2;
+    UINT16 PowerIndicator : 2;
+    UINT16 PowerController : 1;
+    UINT16 ElectromechanicalInterlock : 1;
+    UINT16 DataLinkLayerStateChanged : 1;
+    UINT16 Reserved : 3;
   } Bits;
   UINT16   Uint16;
 } PCI_REG_PCIE_SLOT_CONTROL;
-- 
2.12.2.windows.2