x86, boot: Exclude early_serial_console.c if can't use it.
Removes early_serial_console.c code if we don't have the config option that enables it (EARLY_PRINTK). When disabling this code, make early_serial_base a constant 0 to allow the compiler to optimize away the code that checks for early_serial_base. Signed-off-by: NJoe Millenbach <jmillenbach@gmail.com> Link: http://lkml.kernel.org/r/1342746282-28497-7-git-send-email-jmillenbach@gmail.comSigned-off-by: NGokul Caushik <caushik1@gmail.com> Reviewed-by: NJosh Triplett <josh@joshtriplett.org> Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
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