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
(cherry picked from commit 461e4ecb37e3d6205972d9c4e6d157e7bbeceecc)
keys: Updated path for the signing makefile

Change-Id: I0b293829539682a8fc3b4b672f488b5c53f81282
(cherry picked from commit 178dbd6829125a0dbaac8e32b543df3a72ab6910)
init.local.rc: Fix typo

Change-Id: Iec9b4c84cfc8c594558cab55a597cbefa6171d33
(cherry picked from commit 7a46cf78170979f6a85a23cc1c3506ce801c8696)