Proper core_millivolts size.

Signed-off-by: Xmister <xmisterhu@gmail.com>
#259

Signed-off-by: Xmister <xmisterhu@gmail.com>
tegra3_dvfs.c: Add Fail-safe voltage to tegra3_get_core_floor_mv

Signed-off-by: Xmister <xmisterhu@gmail.com>