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

syscon regmap is not used since commit addebf15 ("mfd: exynos-lpass:
Remove pad retention control").

Fixes: addebf15 ("mfd: exynos-lpass: Remove pad retention control")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20220202151310.285561-3-krzysztof.kozlowski@canonical.com

drivers/mfd/exynos-lpass.c

@@ -15,7 +15,6 @@
 #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>