The regex pattern for extracting speedometer score causes these
exceptions due to unescaped \d and \/ sequences:
wa/workloads/speedometer/__init__.py:109: SyntaxWarning: invalid escape
sequence '\d'
'(?:text|content-desc)="(?P<value>\d+.\d+)"[^>]*'
wa/workloads/speedometer/__init__.py:110: SyntaxWarning: invalid escape
sequence '\/'
'(?(Z)|resource-id="result-number")[^>]*\/>'
Fix the problem via defining the regex pattern as raw string literal to
properly escape backslashes.
Signed-off-by: Metin Kaya <metin.kaya@arm.com>