semc/msm7x30: Fix execution of pre_hw_config.sh (2/2)

pre_hw_config.sh should be executed on init before we enable the leds/keyboard backlight for recovery boot indication.
This change is needed after the new 2 stage boot method
The script was also never executed because it's located under / and not under /system/etc/

Signed-off-by: Michael Bestas <mikeioannina@gmail.com>

Change-Id: I3e84430f2969fae80db53c24dc48b60eda0a4d58