console: Simplify the enable rules

Consoles on CBMEM and USB have somewhat complex rules and dependencies
when they can be active. Use simple variables to test which stage
of boot is being built for each console.

Change-Id: I2489e7731d07ca7d5dd2ea8b6501c73f05d6edd8
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5341
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
diff --git a/src/include/console/qemu_debugcon.h b/src/include/console/qemu_debugcon.h
index 63b1455..257ae58 100644
--- a/src/include/console/qemu_debugcon.h
+++ b/src/include/console/qemu_debugcon.h
@@ -1,7 +1,18 @@
 #ifndef _QEMU_DEBUGCON_H_
 #define _QEMU_DEBUGCON_H_
 
+#include <rules.h>
+#include <stdint.h>
+
 void qemu_debugcon_init(void);
 void qemu_debugcon_tx_byte(unsigned char data);
 
+#if CONFIG_CONSOLE_QEMU_DEBUGCON && (ENV_ROMSTAGE || ENV_RAMSTAGE)
+static inline void __qemu_debugcon_init(void)	{ qemu_debugcon_init(); }
+static inline void __qemu_debugcon_tx_byte(u8 data)	{ qemu_debugcon_tx_byte(data); }
+#else
+static inline void __qemu_debugcon_init(void)	{}
+static inline void __qemu_debugcon_tx_byte(u8 data)	{}
+#endif
+
 #endif