Account for padding in KeyguardStatusBarView

KeyguardStatusBarView was adding padding to account for potential
cutouts and rounded corner padding in addition to adding margin to the
system icons and carrier text view.  Instead, take into account the
padding when calculating the margins on the elements in
KeyguardStatusBarView.

Test: manually tested LTR and RTL languages
Fixes: 152020130
Change-Id: I4b724de78a54c7fe852710720a4f9511ae7f039c