Stop injection KeyguardBypassController into NSSL

Most importantly, this change moves the call to initView
out of NotificationStackScrollLayout's constructor. It is now called
by NotificationStackScrollLayoutController once it is attached.

The controller now supplies a KeyguardBypassEnabledProvider instead of
supplying the KeyguardBypassController directly.

Bug: 147245740
Test: atest SystemUITests
Change-Id: I167b23a51167f89bef1817f59264257586bc31c5