MIPS currently lacks the readl_be and writel_be accessors
which are required by BCM63xx for OHCI and EHCI support.
Let's define them globally for MIPS. This also fixes the
compilation of the bcm63xx defconfig against USB.

Signed-off-by: Florian Fainelli <ffainelli@freebox.fr>
---
--- a/arch/mips/include/asm/io.h
+++ b/arch/mips/include/asm/io.h
@@ -447,6 +447,9 @@ __BUILDIO(q, u64)
 #define readl_relaxed			readl
 #define readq_relaxed			readq
 
+#define readl_be(addr)			be32_to_cpu(__raw_readl((__force unsigned *)(addr)))
+#define writel_be(val, addr)		__raw_writel(cpu_to_be32((val)), (__force unsigned *)(addr))
+
 /*
  * Some code tests for these symbols
  */