vendor/cm: Clean up init.local.rc

These changes fix the error below found in a logcat and clean up some other issues in the file.

"E CM PowerHAL: Error opening /sys/devices/system/cpu/cpufreq/ondemand/sampling_rate: Permission denied"

	PS2: tweaked permissions & removed dupilcated entries

Change-Id: I9b1bbe66c36ba0d8de13b8cb9351d2952851c250
No need to override mkshrc as it no longer exports PS1

busybox sh works fine with the one in android_external_mksh

Change-Id: I09ae2d16837053ea0be50d3320eccf47057e25c1
keys: Updated path for the signing makefile

Change-Id: I0b293829539682a8fc3b4b672f488b5c53f81282
Merge "vendor/cm: Clean up init.local.rc" into cm-10.2
Merge branch 'cr-main-10.2' of https://github.com/cristianomatos/android_vendor_cm into cr-main-10.2
Merge branch 'cm-10.2' of https://github.com/CyanogenMod/android_vendor_cm into cr-main-10.2