usbdebug: Change reference to EHCI BAR

Change the defines, as follow-up patch will replace use of
constant CONFIG_EHCI_BAR.

Change-Id: I44ff77cb7a2826f3b43d8d46440fd4482a29d18c
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/3875
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>
diff --git a/src/southbridge/amd/agesa/hudson/enable_usbdebug.c b/src/southbridge/amd/agesa/hudson/enable_usbdebug.c
index 147056d..dda29c1 100644
--- a/src/southbridge/amd/agesa/hudson/enable_usbdebug.c
+++ b/src/southbridge/amd/agesa/hudson/enable_usbdebug.c
@@ -30,19 +30,20 @@
 #define HUDSON_DEVN_BASE 0
 #endif
 
-#define EHCI_EOR		(CONFIG_EHCI_BAR + 0x20)
-#define DEBUGPORT_MISC_CONTROL	(EHCI_EOR + 0x80)
+#define EHCI_EOR				0x20
+#define DEBUGPORT_MISC_CONTROL		0x80
 
 void set_debug_port(unsigned int port)
 {
+	u32 base_regs = CONFIG_EHCI_BAR + EHCI_EOR;
 	u32 reg32;
 
 	/* Write the port number to DEBUGPORT_MISC_CONTROL[31:28]. */
-	reg32 = read32(DEBUGPORT_MISC_CONTROL);
+	reg32 = read32(base_regs + DEBUGPORT_MISC_CONTROL);
 	reg32 &= ~(0xf << 28);
 	reg32 |= (port << 28);
 	reg32 |= (1 << 27); /* Enable Debug Port port number remapping. */
-	write32(DEBUGPORT_MISC_CONTROL, reg32);
+	write32(base_regs + DEBUGPORT_MISC_CONTROL, reg32);
 }