mfd: exynos-lpass: Drop unneeded syscon.h include

syscon regmap is not used since commit addebf1588ab ("mfd: exynos-lpass:
Remove pad retention control").

Fixes: addebf1588ab ("mfd: exynos-lpass: Remove pad retention control")
Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Alim Akhtar <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/mfd/exynos-lpass.c

···
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/module.h>
-#include <linux/mfd/syscon.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>