linux-wandboard

ENGR00162646 [DVFS]Fix build warning

Fix dvfs_core build warning:

  arch/arm/plat-mxc/dvfs_core.c:824: warning: 'downthreshold_show'
  defined but not used

  arch/arm/plat-mxc/dvfs_core.c:830: warning: 'downthreshold_store'
  defined but not used

  arch/arm/plat-mxc/dvfs_core.c:842: warning: 'downcount_show' defined
  but not used

  arch/arm/plat-mxc/dvfs_core.c:848: warning: 'downcount_store' defined
  but not used

Signed-off-by: Anson Huang <b20788@freescale.com>