Only ONE view controller controls KeyguardIndication

If a new keyguard indication area is being set,
destroy the old RotateTextViewController so that
there's only one KeyguardIndicationRotateTextViewController
for the keyguard indication view.

The stale RotateTextViewController was causing an old charging
message to surface on LS.

Test: atest KeyguardIndicationControllerTest KeyguardIndicationRotateTextViewController
Fixes: 279115823
Change-Id: Ic9735f0029e2055948542eaee75b6befbedea892