[arm] Fix warning in parsecpu.awk

In awk, single quotes within a quoted string do not need escaping.
The existing code causes awk to grumble in the build logs.

	* config/arm/parsecpu.awk (gen_comm_data): Do not escape single quotes
	in quoted strings.

From-SVN: r250016

gcc/ChangeLog

 2017-07-06  Richard Earnshaw  <rearnsha@arm.com>
 
+	* config/arm/parsecpu.awk (gen_comm_data): Do not escape single quotes
+	in quoted strings.
+
+2017-07-06  Richard Earnshaw  <rearnsha@arm.com>
+
 	* config/arm/t-arm (GTM_H): Add arm-cpu.h.
 
 2017-07-06  Christophe Lyon  <christophe.lyon@linaro.org>