Settings: Fix some interface show abnormal in RTL

The ic_bt_cellphone icon color in ldrtl folder is white, it cannot be seen
in white background.
4G switch and MultiSimEnablerPreference layout properties is left/right,
that don't fit RTL mode.

Modify ic_bt_cellphone icon color to green to be consistent with the icon
color in normal folder.
Convert left/right layout properties to start/end properties.

Change-Id: I16ee4a7d485f594e817623fa4699c9e332d28e61