vt: keyboard, remove unneeded func_* declarations

Now that we removed the ugly handling of func_buf, remove unneeded
declarations of func_* variables. The definitions are in the generated
defkeymap.c_shipped, so we cannot really remove them (but we would love
to).
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20201029113222.32640-13-jslaby@suse.czSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/kbd_kern.h

@@ -9,9 +9,6 @@
 extern struct tasklet_struct keyboard_tasklet;
 
 extern char *func_table[MAX_NR_FUNC];
-extern char func_buf[];
-extern char *funcbufptr;
-extern int funcbufsize, funcbufleft;
 
 /*
  * kbd->xxx contains the VC-local things (flag settings etc..)