Fix invalid escape sequence in rocm_agent_enumerator, which are deprecated in Python3

In Python3, unescaped backslashes in regular expressions are deprecated, and these were generating SyntaxWarnings.

Patch submitted by (Tianao Ge <getianao@gmail.com>) on github:
https://github.com/ROCm/rocminfo/pull/55

Change-Id: Icbcf2803291add5b5f3971ac9901a8927d23f225

rocm_agent_enumerator

@@ -92,7 +92,7 @@ def getGCNISA(line, match_from_beginning = False):
    return result.group(0)
  return None
 
-@staticVars(search_name=re.compile("gfx[0-9a-fA-F]+(:[-+:\w]+)?"))
+@staticVars(search_name=re.compile(r"gfx[0-9a-fA-F]+(:[-+:\w]+)?"))
 def getGCNArchName(line):
  result = getGCNArchName.search_name.search(line)
 
@@ -149,9 +149,9 @@ def readFromROCMINFO(search_arch_name = False):
 
   # search AMDGCN gfx ISA
   if search_arch_name is True:
-    line_search_term = re.compile("\A\s+Name:\s+(amdgcn-amd-amdhsa--gfx\d+)")
+    line_search_term = re.compile(r"\A\s+Name:\s+(amdgcn-amd-amdhsa--gfx\d+)")
   else:
-    line_search_term = re.compile("\A\s+Name:\s+(gfx\d+)")
+    line_search_term = re.compile(r"\A\s+Name:\s+(gfx\d+)")
   for line in rocminfo_output:
     if line_search_term.match(line) is not None:
       if search_arch_name is True:
@@ -172,7 +172,7 @@ def readFromLSPCI():
   except:
     lspci_output = []
 
-  target_search_term = re.compile("1002:\w+")
+  target_search_term = re.compile(r"1002:\w+")
   for line in lspci_output:
     search_result = target_search_term.search(line)
     if search_result is not None: