The ARM CPU suspend function has its own configuration symbol,
which we need to use for conditionalizing any code calling into
it as well.

arch/arm/mach-imx/built-in.o: In function `v7_cpu_resume':
/git/arm-soc/arch/arm/mach-imx/headsmp.S:57: undefined
 reference to `cpu_resume'

Cc: Sascha Hauer <kernel@pengutronix.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>