Update attn1 MMC_ERASE safe kernel

Change-Id: Ib9f4b86ee7c7b0a8b28b1c53a07f69aef06303d2

View this commit by attn1: https://github.com/CyanogenMod/android_device_pantech_presto/commit/7911c194b02d0c7cae8fd8b96adf8a81cc63b6fd