[Settings] Squash commits of lockscreen customize (2/2)

See frameowrk part

Change-Id: Id3a03fde51b391d6d9dc722460a5912ea0276b73
[2/2]Settings: Stylus Gestures

Change-Id: I9ca9fa237709a6237bbcd9ecf329bc9aa7e6321c
Settings: Toggle Stylus Pointer Icon [2/2]

For devices with s-pen, this adds an option to disable
the mouse pointer when using s-pen

Change-Id: I8e752a8c8fd6a276eaf9b6bf20ad89d5ce3459ba
Add an option/category in Dev Set to customize the device hostname (2/2).

PS2:
- cleanup

Change-Id: Iee14e90fa6fb6a13a123d92b7cf6dceaf6d18ffc