i9300: enable eject sdcard

Change-Id: Ic38fca9b0972e2e54b2972c4800e675203e2f04e
JIRA: CYAN-4539
Issue: https://jira.cyanogenmod.org/browse/CYAN-4539
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_device_samsung_i9300 into HEAD