This patch fix the following build problem:

  CC      arch/arm/mach-omap2/pm.o
arch/arm/mach-omap2/pm.c: In function 'omap2_pm_init':
arch/arm/mach-omap2/pm.c:840: warning: passing argument 2 of 'sysfs_create_file' from incompatible pointer type
Signed-off-by: Carlos Eduardo Aguiar <carlos.aguiar@indt.org.br>
Signed-off-by: Tony Lindgren <tony@atomide.com>