powerpc/udbg: Register udbg console generically

When CONFIG_PPC_EARLY_DEBUG is set, call register_early_udbg_console()
early from generic code.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/platforms/pseries/lpar.c

@@ -193,8 +193,6 @@ void __init udbg_init_debug_lpar(void)
 	udbg_putc = udbg_putcLP;
 	udbg_getc = udbg_getcLP;
 	udbg_getc_poll = udbg_getc_pollLP;
-
-	register_early_udbg_console();
 }
 
 /* returns 0 if couldn't find or use /chosen/stdout as console */