ARM: zynq: fix compilation warning

Fix the following compilation warning:

arch/arm/mach-zynq/common.c:110:2: warning: initialization from incompatible pointer type [enabled by default]
arch/arm/mach-zynq/common.c:110:2: warning: (near initialization for ‘__mach_desc_XILINX_EP107.restart’) [enabled by default]

Signed-off-by: Vincent Stehlé <[e-mail]>
Cc: Robin Holt <[e-mail]>
Cc: Michal Simek <[e-mail]>
Cc: Russell King <[e-mail]>
Cc: [e-mail]
Signed-off-by: Olof Johansson <[e-mail]>

arch/arm/mach-zynq/common.c

···
 	zynq_scu_map_io();
 }
 
-static void zynq_system_reset(char mode, const char *cmd)
+static void zynq_system_reset(enum reboot_mode mode, const char *cmd)
 {
 	zynq_slcr_system_reset();
 }