utils: checkstyle: Remove style checker for python pep8

The issues detected and fixed by autopep8 are the same as the ones
detected by pycodestyle. As the formatter runs unconditionally we can
remove the checker.

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

utils/checkstyle.py

@@ -709,39 +709,6 @@ class MesonChecker(StyleChecker):
         return issues
 
 
-class Pep8Checker(StyleChecker):
-    patterns = ('*.py',)
-    results_regex = re.compile(r'stdin:([0-9]+):([0-9]+)(.*)')
-
-    def __init__(self, content):
-        super().__init__()
-        self.__content = content
-
-    def check(self, line_numbers):
-        issues = []
-        data = ''.join(self.__content).encode('utf-8')
-
-        try:
-            ret = subprocess.run(['pycodestyle', '--ignore=E501', '-'],
-                                 input=data, stdout=subprocess.PIPE)
-        except FileNotFoundError:
-            issues.append(StyleIssue(0, None, None, 'Please install pycodestyle to validate python additions'))
-            return issues
-
-        results = ret.stdout.decode('utf-8').splitlines()
-        for item in results:
-            search = re.search(Pep8Checker.results_regex, item)
-            line_number = int(search.group(1))
-            position = int(search.group(2))
-            msg = search.group(3)
-
-            if line_number in line_numbers:
-                line = self.__content[line_number - 1]
-                issues.append(StyleIssue(line_number, None, line, msg))
-
-        return issues
-
-
 class ShellChecker(StyleChecker):
     patterns = ('*.sh',)
     results_line_regex = re.compile(r'In - line ([0-9]+):')