cpufreq: Fix typo in the ARM_BRCMSTB_AVS_CPUFREQ Kconfig entry

Delete the redundant word 'to' from the help text in the
ARM_BRCMSTB_AVS_CPUFREQ Kconfig entry.

Signed-off-by: Jingyu Wang <jingyuwang_vip@163.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Author: lemon1989

drivers/cpufreq/Kconfig.arm

@@ -95,7 +95,7 @@ config ARM_BRCMSTB_AVS_CPUFREQ
 	help
 	  Some Broadcom STB SoCs use a co-processor running proprietary firmware
 	  ("AVS") to handle voltage and frequency scaling. This driver provides
-	  a standard CPUfreq interface to to the firmware.
+	  a standard CPUfreq interface to the firmware.
 
 	  Say Y, if you have a Broadcom SoC with AVS support for DFS or DVFS.