board_inspector: maintain a mapping from cap names to cap struct

In order to ease the access of certain capability structure of a PCI config
space, this patch changes the class PCIConfigSpace to maintain a
_caps_as_dict dictionary that maps capability names (as specified in the
caps.py and extcaps.py) to the actual capability structures.

Tracked-On: #7301
Signed-off-by: Junjie Mao <junjie.mao@intel.com>

misc/config_tools/board_inspector/pcieparser/__init__.py

@@ -22,14 +22,20 @@ class PCIConfigSpace(namedtuple("PCIConfigSpace", ["header", "caps", "extcaps"])
             acc += str(extcap)
         return acc
 
+    def caps_as_dict(self):
+        if not hasattr(self, "_caps_as_dict"):
+            self._caps_as_dict = dict()
+            for cap in self.caps:
+                self._caps_as_dict[cap.name] = cap
+            for cap in self.extcaps:
+                self._caps_as_dict[cap.name] = cap
+        return self._caps_as_dict
+
     def has_cap(self, cap_name):
-        for cap in self.caps:
-            if cap_name == cap.name:
-                return True
-        for cap in self.extcaps:
-            if cap_name == cap.name:
-                return True
-        return False
+        return cap_name in self.caps_as_dict().keys()
+
+    def get_cap(self, cap_name):
+        return self.caps_as_dict().get(cap_name)
 
 def parse_config_space(path):
     try: