Revert "random: make 'add_interrupt_randomness()' do something sane"

This reverts commit f9380131c44bebe9d49601675e657d66de422497.

Conflicts:
	drivers/char/random.c
Revert "Bluetooth: Fix not removing power_off delayed work"

This reverts commit d356f0164f1a473c501ddb1174e12f766c170f17.
Revert "Bluetooth: Fix legacy pairing with some devices"

This reverts commit 0314e85cbd03c673b1fb3823ba85ed8f8e3768e2.
Revert "Bluetooth: Change signature of smp_conn_security()"

This reverts commit e0acf9d013c0e13c5f3440dc816b4f0e7f6e64e4.
Revert "Bluetooth: Fix sending a HCI Authorization Request over LE links"

This reverts commit c3e8b7a661b64c775c1ce871eb236bca35c13d83.
Linux 3.4.12