ARM: shmobile: armadillo800eva-reference: fix compiler warning

Fix the compiler warning:

arch/arm/mach-shmobile/board-armadillo800eva-reference.c:196:2: warning: initialization from incompatible pointer type [enabled by default]
arch/arm/mach-shmobile/board-armadillo800eva-reference.c:196:2: warning: (near initialization for '__mach_desc_ARMADILLO800EVA_DT.restart') [enabled by default]

While at it also remove superfluous parenthesis.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/mach-shmobile/board-armadillo800eva-reference.c

@@ -190,10 +190,10 @@ static void __init eva_init(void)
 }
 
 #define RESCNT2 IOMEM(0xe6188020)
-static void eva_restart(char mode, const char *cmd)
+static void eva_restart(enum reboot_mode mode, const char *cmd)
 {
 	/* Do soft power on reset */
-	writel((1 << 31), RESCNT2);
+	writel(1 << 31, RESCNT2);
 }
 
 static const char *eva_boards_compat_dt[] __initdata = {