ARM: at91: finally drop at91_sys_read/write

Remove at91_sys_read/write() from io.h file. This function
is not used anymore and was a stopper on the way to single
zImage kernel for AT91.
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>

arch/arm/mach-at91/include/mach/io.h

@@ -28,22 +28,4 @@
 #define __io(a)		__typesafe_io(a)
 #define __mem_pci(a)	(a)
 
-#ifndef __ASSEMBLY__
-
-static inline unsigned int at91_sys_read(unsigned int reg_offset)
-{
-	void __iomem *addr = (void __iomem *)AT91_VA_BASE_SYS;
-
-	return __raw_readl(addr + reg_offset);
-}
-
-static inline void at91_sys_write(unsigned int reg_offset, unsigned long value)
-{
-	void __iomem *addr = (void __iomem *)AT91_VA_BASE_SYS;
-
-	__raw_writel(value, addr + reg_offset);
-}
-
-#endif
-
 #endif