powerpc: Remove virt_to_abs() now all users have been fixed

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/include/asm/abs_addr.h

@@ -18,8 +18,5 @@
 #include <asm/page.h>
 #include <asm/prom.h>
 
-/* Convenience macros */
-#define virt_to_abs(va) __pa(va)
-
 #endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_ABS_ADDR_H */