soc: renesas: rcar-sysc: Make rcar_sysc_power_is_off() static

As of commit b12ff416 ("ARM: shmobile: r8a7779: Remove legacy PM
Domain remainings"), rcar_sysc_power_is_off() is no longer used from
SoC-specific code.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

drivers/soc/renesas/rcar-sysc.c

@@ -152,7 +152,7 @@ int rcar_sysc_power_up(const struct rcar_sysc_ch *sysc_ch)
 	return rcar_sysc_power(sysc_ch, true);
 }
 
-bool rcar_sysc_power_is_off(const struct rcar_sysc_ch *sysc_ch)
+static bool rcar_sysc_power_is_off(const struct rcar_sysc_ch *sysc_ch)
 {
 	unsigned int st;
 

include/linux/soc/renesas/rcar-sysc.h

@@ -11,7 +11,6 @@ struct rcar_sysc_ch {
 
 int rcar_sysc_power_down(const struct rcar_sysc_ch *sysc_ch);
 int rcar_sysc_power_up(const struct rcar_sysc_ch *sysc_ch);
-bool rcar_sysc_power_is_off(const struct rcar_sysc_ch *sysc_ch);
 void __iomem *rcar_sysc_init(phys_addr_t base);
 
 #endif /* __LINUX_SOC_RENESAS_RCAR_SYSC_H__ */