powerpc: Introduce entry_{32,64}.S, misc_{32,64}.S, systbl.S

The system call table has been consolidated into systbl.S.  We have
separate 32-bit and 64-bit versions of entry.S and misc.S since the
code is mostly sufficiently different to be not worth merging.
There are some common bits that will be extracted in future.

Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --cc arch/powerpc/Makefile
Simple merge

diff --cc arch/powerpc/kernel/Makefile
Simple merge

diff --cc arch/powerpc/kernel/entry_32.S
Simple merge

diff --cc arch/powerpc/kernel/entry_64.S
Simple merge

diff --cc arch/powerpc/kernel/misc_32.S
Simple merge

diff --cc arch/powerpc/kernel/misc_64.S
Simple merge

diff --cc arch/powerpc/kernel/systbl.S
Simple merge