arm: remove prototype for get_timer_masked

The interruption support had be removed for ARM architecture and
the function get_timer_masked() is no more used except in some
the timer.c files.

This patch clean each timer.c which implement this function and
remove the associated prototype in u-boot-arm.h

For timer.c, I don't verify if the weak version of get_timer
(in lib/time.c) can be used

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/board/armltd/integrator/timer.c b/board/armltd/integrator/timer.c
index 53086c7..7ecfa49 100644
--- a/board/armltd/integrator/timer.c
+++ b/board/armltd/integrator/timer.c
@@ -93,31 +93,10 @@
 /*
  * timer without interrupts
  */
-ulong get_timer (ulong base_ticks)
-{
-	return get_timer_masked () - base_ticks;
-}
-
-/* delay usec useconds */
-void __udelay (unsigned long usec)
-{
-	ulong tmo, tmp;
-
-	/* Convert to U-Boot ticks */
-	tmo  = usec * CONFIG_SYS_HZ;
-	tmo /= (1000000L);
-
-	tmp  = get_timer_masked();	/* get current timestamp */
-	tmo += tmp;			/* form target timestamp */
-
-	while (get_timer_masked () < tmo) {/* loop till event */
-		/*NOP*/;
-	}
-}
 
 /* converts the timer reading to U-Boot ticks	       */
 /* the timestamp is the number of ticks since reset    */
-ulong get_timer_masked (void)
+static ulong get_timer_masked (void)
 {
 	/* get current count */
 	unsigned long long now = READ_TIMER;
@@ -138,6 +117,28 @@
 	return timestamp;
 }
 
+ulong get_timer (ulong base_ticks)
+{
+	return get_timer_masked () - base_ticks;
+}
+
+/* delay usec useconds */
+void __udelay (unsigned long usec)
+{
+	ulong tmo, tmp;
+
+	/* Convert to U-Boot ticks */
+	tmo  = usec * CONFIG_SYS_HZ;
+	tmo /= (1000000L);
+
+	tmp  = get_timer_masked();	/* get current timestamp */
+	tmo += tmp;			/* form target timestamp */
+
+	while (get_timer_masked () < tmo) {/* loop till event */
+		/*NOP*/;
+	}
+}
+
 /*
  * This function is derived from PowerPC code (read timebase as long long).
  * On ARM it just returns the timer value.