ARM: OMAP2+: Drop legacy struct omap_hwmod_addr_space

With all of mach-omap2 booting now in device tree only mode,
we can get the module IO range from device tree and just drop
the legacy hwmod struct omap_hwmod_addr_space.

Cc: Lokesh Vutla <lokeshvutla@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>