Lockscreen Notifications: use the correct member visilibility access modifiers

using private modifier on outter class members requires the compiler to generate
additional accessor methods when access is requested by inner classes. This
is effectively doing the opposite of inlining code and can slow things down

Change-Id: I4a7333e4cbbfacedac22998404330d325a253ae1

Conflicts:
	packages/Keyguard/src/com/android/keyguard/NotificationHostView.java
lockscreen notifications: inline some trivial methods

...

Change-Id: Ice5996ec1947d547ada7e813aec0135a3daddb72

Conflicts:
	packages/Keyguard/src/com/android/keyguard/NotificationHostView.java