sparc64: implement ioremap_uc

On sparc64, the whole physical IO address space is accessible using
physically addressed loads and stores. *_uc does nothing like the
others.

Cc: <stable@vger.kernel.org> # v4.19+
Reported-by: Nkbuild test robot <lkp@intel.com>
Signed-off-by: NTuowen Zhao <ztuowen@gmail.com>
Acked-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

arch/sparc/include/asm/io_64.h

@@ -407,6 +407,7 @@ static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
 }
 
 #define ioremap_nocache(X,Y)		ioremap((X),(Y))
+#define ioremap_uc(X,Y)			ioremap((X),(Y))
 #define ioremap_wc(X,Y)			ioremap((X),(Y))
 #define ioremap_wt(X,Y)			ioremap((X),(Y))