SH: improve the way sh7750 registers io memory (Takashi YOSHII).

SH: improve the way sh7750 registers io memory (Takashi YOSHII).

Fixes to be needed for commit #5849 "Change MMIO callbacks..."
 hw/sh7750.c:
  - Divide region of CPU control registers to avoid overlapping
    to peripheral modules.
  - Delete unused var "icr", which had moved to hw/sh_intc.c.
 hw/sm501.c:
  - Merge non page aligned palette registers into the region of
    control registers.

Signed-off-by: Takashi YOSHII <takasi-y@ops.dti.ne.jp>
Signed-off-by: Andrzej Zaborowski <andrew.zaborowski@intel.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5934 c046a42c-6fe2-441c-8c8c-71466251a162