fix compile error, with CONFIG_EARLY_PRINTK not set

target/linux/patches/3.13.6/microblaze-early-printk.patch

@@ -0,0 +1,12 @@
+diff -Nur linux-3.13.6.orig/arch/microblaze/include/asm/setup.h linux-3.13.6/arch/microblaze/include/asm/setup.h
+--- linux-3.13.6.orig/arch/microblaze/include/asm/setup.h	2014-03-07 07:07:02.000000000 +0100
++++ linux-3.13.6/arch/microblaze/include/asm/setup.h	2014-03-12 13:28:53.315145258 +0100
+@@ -19,8 +19,6 @@
+ 
+ extern char *klimit;
+ 
+-void early_printk(const char *fmt, ...);
+-
+ int setup_early_printk(char *opt);
+ void remap_early_printk(void);
+ void disable_early_printk(void);