powerpc: merge idle_power4.S and trapc.s

Use idle_power4.S from ppc64 as we are not going to support
32 bit power4 in the merged tree.

Merge ppc64 traps.c into powerpc traps.c:
	use ppc64 versions of exception routine names
		(as they don't have StudlyCaps)
	make all the versions if die() have the same
		prototype

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
diff --git a/arch/ppc/syslib/ibm44x_common.c b/arch/ppc/syslib/ibm44x_common.c
index 7612e06..95e11f9 100644
--- a/arch/ppc/syslib/ibm44x_common.c
+++ b/arch/ppc/syslib/ibm44x_common.c
@@ -178,7 +178,7 @@
 #endif
 }
 
-/* Called from MachineCheckException */
+/* Called from machine_check_exception */
 void platform_machine_check(struct pt_regs *regs)
 {
     	printk("PLB0: BEAR=0x%08x%08x ACR=  0x%08x BESR= 0x%08x\n",