ARM: arm720t: Add missing CONFIG_SKIP_LOWLEVEL_INIT guard for cpu_init_crit

cpu_init_crit() can be skipped, but the code is still enabled requiring a
platform to supply lowlevel_init().

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>

arch/arm/cpu/arm720t/start.S

@@ -244,6 +244,7 @@ c_runtime_cpu_setup:
  *************************************************************************
  */
 
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT
 cpu_init_crit:
 
 #if !defined(CONFIG_TEGRA)
@@ -258,6 +259,7 @@ cpu_init_crit:
 #endif
 
 	mov	pc, lr
+#endif /* CONFIG_SKIP_LOWLEVEL_INIT */
 
 
 #ifndef CONFIG_SPL_BUILD