epicmtd: libcamera: don't error when disabling focus move callback

We don't support it, but we shouldn't error out when someone tries to
disable it either. Required to support video mode on Google Camera

Change-Id: I09150b4491614f4618619ddc77780a71840a296c
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_device_samsung_epicmtd into cd-4.4