Remove reference to the missing touchboost file

This should reduce the log flood regarding the touchboost file being missing and hence fix [AOSPA-224](https://paranoidandroid.atlassian.net/browse/AOSPA-224).

I'm using "should" here since I haven't rebuilt the whole project, but am basing this on the fact that [hardware/qcom/power/Android.mk](https://github.com/AOSPA/android_hardware_qcom_power/blob/47f976b87c3adbd1ca236c55aa34024cd4afeba7/Android.mk#L17-L19) and [hardware/qcom/power/power.c](https://github.com/AOSPA/android_hardware_qcom_power/blob/47f976b87c3adbd1ca236c55aa34024cd4afeba7/power.c#L37-L39) should default back to /dev/socket/pb which actually exists on the device.