block: update bfq iosched v6 -> v6r1
abb-regu: add VOTG sysfs interface

Enable/disable power supply for OTG only.
cpuidle: deepest state 4 -> 3
block: bfq iosched v6r1 -> v5r1

BFQ v6r1 is unstable!
defconfig: version tag 6.1 -> 6.2