powerpc/e6500: remove the stale TCD_LOCK macro

Since we moved the "lock" to be the first element of
struct tlb_core_data in commit 82d86de2 ("powerpc/e6500: Make TLB
lock recursive"), this macro is not used by any code. Just delete it.
Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>

arch/powerpc/kernel/asm-offsets.c

@@ -213,7 +213,6 @@ int main(void)
 		offsetof(struct tlb_core_data, esel_max));
 	DEFINE(TCD_ESEL_FIRST,
 		offsetof(struct tlb_core_data, esel_first));
-	DEFINE(TCD_LOCK, offsetof(struct tlb_core_data, lock));
 #endif /* CONFIG_PPC_BOOK3E */
 
 #ifdef CONFIG_PPC_STD_MMU_64