Add Auto Hotplug

Ext4 tweaks... (Thx Edoko)
	modified:   arch/arm/Kconfig
	modified:   arch/arm/kernel/Makefile
	modified:   block/Kconfig.iosched
	modified:   drivers/base/sync.c
	modified:   fs/ext4/ext4.h
	modified:   fs/ext4/inode.c

Conflicts:
	drivers/base/sync.c

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