ARM: shmobile: Fix build problem in pm-sh7372.c for unusual .config

ARM: shmobile: Fix build problem in pm-sh7372.c for unusual .config

If neither CONFIG_SUSPEND nor CONFIG_CPU_IDLE is set in the kernel
configuration file, build error occurs in
arch/arm/mach-shmobile/pm-sh7372.c.

Fix it by rearranging #ifdefs in that file to make the
definition of sh7372_suspend_init() depend only on
CONFIG_SUSPEND and the definition of sh7372_cpuidle_init()
depend only on CONFIG_CPU_IDLE.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Magnus Damm <damm@opensource.se>