OMAP SSI build error

[Russell King - ARM Linux]

I recently spotted this build error (via a randconfig build):

drivers/hsi/controllers/omap_ssi_port.c: In function 'ssi_port_probe':
drivers/hsi/controllers/omap_ssi_port.c:1119:2: error: implicit declaration of function 'ref_module'

Looks like it's missing out on including linux/module.h which provides
the prototype for this function.

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