src/console: Add x86 romstage spinlock option and printk spinlock support

This paves the way for AP printk spinlock on AMD platforms

Change-Id: Ice42a0d3177736bf6e1bc601092e413601866f20
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: https://review.coreboot.org/11958
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/Kconfig b/src/Kconfig
index 818eb59..46349c5 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -476,6 +476,10 @@
 	  This variable specifies whether a given board has a hard_reset
 	  function, no matter if it's provided by board code or chipset code.
 
+config HAVE_ROMSTAGE_CONSOLE_SPINLOCK
+	bool
+	default n
+
 config HAVE_MONOTONIC_TIMER
 	def_bool n
 	help