Revert "Set sdcard as non-removable (workaround for mediaprovider bug)"

See references for more info

Reference: https://github.com/androidarmv6/android_frameworks_base/commit/3d459f082ab274117b021c9061490f77238976e9
Reference: https://github.com/CyanogenMod/android_system_vold/commit/84aa7ed0171f5f64ba58d2d785a39004a7ba2886
Reference: http://review.cyanogenmod.org/#/c/66055/
Reference: http://review.cyanogenmod.org/#/c/66057/

This reverts commit d7d447a3469fadad4aa595c4a1e74cfad8b42c41.

Change-Id: I3bd6e07471e781b2c2e63a690de3c0e7244deb05