[MIPS] Alchemy: export get_au1x00_speed for modules

au1xmmc.c driver depends on it, so export it for modules.
Signed-off-by: Manuel Lauss <mano@roarinelk.homelinux.net>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/au1000/common/clocks.c

@@ -45,6 +45,7 @@ unsigned int get_au1x00_speed(void)
 {
 	return au1x00_clock;
 }
+EXPORT_SYMBOL(get_au1x00_speed);
 
 /*
  * The UART baud base is not known at compile time ... if