Use density independent units for the timer digits for sw360dp

When using scale-independent units, the text is scaled by the user's
font size preference. Since the digits are already big enough to
almost use all the space available, increasing their size simply
pushes part of the text beyond the visible area.

BUGBASH-300

Change-Id: Ibdde29505bf9b11cd0caf7f500c9af8f9fdfcbca