kernel: Add option to disable printk completely

Change-Id: Ibef57b61352d0bf287173ea10356b0021772830b
sched_features: Disable GENTLE_FAIR_SLEEPERS

Original patch: https://github.com/existz/android_kernel_samsung_tuna/commit/e03425fa749f24cd2c09c8d4185607a35cd22fb4
enable NOATIME and NODIRATIME by default

Original patch: https://github.com/existz/android_kernel_samsung_tuna/commit/e03425fa749f24cd2c09c8d4185607a35cd22fb4