microblaze: Kill NET_SKB_PAD and NET_IP_ALIGN overrides.

NET_IP_ALIGN defaults to 2, no need to override.

NET_SKB_PAD is now 64, which is much larger than microblaze's
L1_CACHE_SIZE so no need to override that either.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

arch/microblaze/include/asm/system.h

@@ -97,14 +97,4 @@ extern struct dentry *of_debugfs_root;
 
 #define arch_align_stack(x) (x)
 
-/*
- * MicroBlaze doesn't handle unaligned accesses in hardware.
- *
- * Based on this we force the IP header alignment in network drivers.
- * We also modify NET_SKB_PAD to be a cacheline in size, thus maintaining
- * cacheline alignment of buffers.
- */
-#define NET_IP_ALIGN	2
-#define NET_SKB_PAD	L1_CACHE_BYTES
-
 #endif /* _ASM_MICROBLAZE_SYSTEM_H */