powerpc: Rename asm offset TRAP to _TRAP for 32-bit

... for consistency with 64-bit.

Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index de09787..bc6d1ac 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -175,7 +175,7 @@
 
 #define EXC_XFER_TEMPLATE(n, hdlr, trap, copyee, tfer, ret)	\
 	li	r10,trap;					\
-	stw	r10,TRAP(r11);					\
+	stw	r10,_TRAP(r11);					\
 	li	r10,MSR_KERNEL;					\
 	copyee(r10, r9);					\
 	bl	tfer;						\