arm: fix armv7m_init() declaration to match definition

s/cpu_model/cpu_type/ that has been forgotten during
conversion (ba1ba5cc), while touching the line also
fixup alignment.
Signed-off-by: NIgor Mammedov <imammedo@redhat.com>
Message-id: 1507710805-221721-1-git-send-email-imammedo@redhat.com
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

include/hw/arm/arm.h

@@ -25,7 +25,7 @@ typedef enum {
 
 /* armv7m.c */
 DeviceState *armv7m_init(MemoryRegion *system_memory, int mem_size, int num_irq,
-                      const char *kernel_filename, const char *cpu_model);
+                         const char *kernel_filename, const char *cpu_type);
 /**
  * armv7m_load_kernel:
  * @cpu: CPU