timer: xilinx-timer: use timer_conv_64() to fix timer wrap around

Current xilinx_timer_get_count() implementation does not take into account
the periodic 32-bit wrap arounds, as it directly returns the 32-bit counter
register value. The roll-overs cause problems in the upper timer layers, as
generic timer code expects an incrementing 64-bit value from get_count() to
work correctly.

Add the missing 64-bit up-conversion to fix random hangs/delays in
__udelay().

Fixes: a36d86720f ("microblaze: Convert axi timer to DM driver")
Signed-off-by: Ovidiu Panait <ovpanait@gmail.com>
Reviewed-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/20221012053656.1492457-3-ovpanait@gmail.com
Signed-off-by: Michal Simek <michal.simek@amd.com>

drivers/timer/xilinx-timer.c

@@ -40,7 +40,7 @@ static u64 xilinx_timer_get_count(struct udevice *dev)
 
 	regmap_read(priv->regs, TIMER_COUNTER_OFFSET, &value);
 
-	return value;
+	return timer_conv_64(value);
 }
 
 static int xilinx_timer_probe(struct udevice *dev)