Clean up cpu.h for 24xx, 34xx

Clean up cpu.h for 24xx, 34xx

[ This patch replaces the previous patch from me on this topic,
  "Fix cpu_is_omap343x()" ]

include/asm-arm/arch-omap/cpu.h was always returning 0 for
cpu_is_omap343x().  This caused 3430SDP to fail to boot after the
recent system control module patch.

Also, clean up the existing OMAP2/3 CPU type reporting macros to
evaluate to constants on non-multiboot kernels, and fix some
whitespace and numeric format problems with the recent DEVICE_TYPE
macro changes.

Boot-tested on N800, 2430SDP, and 3430SDP-ES1.

size:

2885444  147008   96280 3128732  2fbd9c vmlinux.3430sdp
2885416  147008   96280 3128704  2fbd80 vmlinux.3430sdp.patched

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>