parisc/timer: Drop PAGE0 from timer file

Signed-off-by: Helge Deller <deller@gmx.de>
diff --git a/src/parisc/timer.c b/src/parisc/timer.c
index ea8214f..9605f91 100644
--- a/src/parisc/timer.c
+++ b/src/parisc/timer.c
@@ -9,8 +9,6 @@
 #include "util.h" // timer_setup
 #include "parisc/pdc.h"
 
-#define PAGE0 ((volatile struct zeropage *) 0UL)
-
 // Setup internal timers.
 void
 timer_setup(void)