ioprio: Allow CAP_SYS_NICE to set IOPRIO_CLASS_RT

sched_setscheduler allows a process with CAP_SYS_NICE to set
real-time policy. Let ioprio_set follow this.

Signed-off-by: Kusanagi Kouichi <slash@ac.auone-net.jp>
block: add REQ_URGENT to request flags
sync: fix timeout = 0 wait behavior

Change-Id: I8b9254e92c26d9f44abbc0c77fb44624de947013
Signed-off-by: Jamie Gennis <jgennis@google.com>
tuna_defconfig: kernel LZ4 compression
tuna_defconfig: HZ value: 256
Added kernel config option 'BCMDHD_WIFI_PM'.

Conflicts:
	drivers/net/wireless/bcmdhd/dhd_linux.c
Revert "netfilter: xt_qtaguid: remove AID_* dependency for access control"

This reverts commit 25f6baf4f5d99c67f865c340cf3bbd10d090ce48.