ARM: shmobile: sh7372: remove unused sh7372_a3sp_init() on !CONFIG_PM

767c0f3aed74be56f268709f5347e6c86d52b408
(PM / shmobile: Remove the stay_on flag from SH7372's PM domains)
commit removed sh7372_a3sp_init().
Now, there is no user for it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>