tplgtool.py: make string comparison in lower case

Topology1 uses upper case strings for PCM and widget
names, while topology2 uses lower case, align string
comparison to use lower case to make it work for both
topology1 and topology2.

Signed-off-by: Chao Song <chao.song@linux.intel.com>

Author: Chao Song

tools/tplgtool.py

@@ -749,12 +749,12 @@ def comp_in_list(comp, comp_list):
                 TplgFormatter.recursive_search_comp(elem, comp_type, comp_list, direction)
 
         if type(node) != list and direction == "forward":
-            if node["widget"]["name"].startswith(comp_type):
+            if node["widget"]["name"].lower().startswith(comp_type):
                 if not comp_in_list(node, comp_list): comp_list.append(node["widget"])
             TplgFormatter.recursive_search_comp(node["sink"], comp_type, comp_list, direction)
 
         if type(node) != list and direction == "backward":
-            if node["widget"]["name"].startswith(comp_type):
+            if node["widget"]["name"].lower().startswith(comp_type):
                 if not comp_in_list(node, comp_list): comp_list.append(node["widget"])
             TplgFormatter.recursive_search_comp(node["source"], comp_type, comp_list, direction)
 
@@ -763,7 +763,7 @@ def comp_in_list(comp, comp_list):
     def find_connected_comp(ref_node, comp_type):
         if ref_node is None:
             return None
-        comp_type = comp_type.upper() # to upper case
+        comp_type = comp_type.lower()
         comp_list = []
         node = ref_node
         TplgFormatter.recursive_search_comp(node, comp_type, comp_list, "forward")