x86, debug: remove early_printk() #ifdefs from head_32.S

Impact: cleanup

Remove such constructs:

 #ifdef CONFIG_EARLY_PRINTK
        call early_printk
 #else
        call printk
 #endif

Not only are they ugly, they are also pointless: a call to printk()
maps to early_printk during early bootup anyway, if CONFIG_EARLY_PRINTK
is enabled.

Signed-off-by: Ingo Molnar <mingo@elte.hu>