init: Add permissions for IO scheduler (mikeNG)

Adapted from https://github.com/LegacyXperia/android_device_semc_msm7x30-common/commit/5e6df8d60f6590e560629b2affd6da5f6a166dec

Change-Id: I86ed2de45c46dfae2d81a3bfe361ee234c720b7b