pm44xx.c is built only when CONFIG_PM is setup,
remove redundant CONFIG_PM check.

This also fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=25022Reported-by: NMartin Etti <ettl.martin@gmx.de>
Signed-off-by: NNishanth Menon <nm@ti.com>
Signed-off-by: NKevin Hilman <khilman@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>