sh: add support for SH7785

Renesas SH7785 has DDR2-SDRAM controller, PCI, and other. This patch supports CPU register's header file.

---

PATCH v2 :
- add Iwamatsu-san e-mail address in include/asm-sh/cpu_sh7785.h.
- fix my e-mail address in same file.

 include/asm-sh/cpu_sh4.h    |    2 +
 include/asm-sh/cpu_sh7785.h |  156 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 158 insertions(+), 0 deletions(-)
 create mode 100644 include/asm-sh/cpu_sh7785.h

index 5a8a5a1..de6eb5a 100644
@@ -39,6 +39,8 @@
 # include <asm/cpu_sh7763.h>
 #elif defined (CONFIG_CPU_SH7780)
 # include <asm/cpu_sh7780.h>
+#elif defined (CONFIG_CPU_SH7785)
+# include <asm/cpu_sh7785.h>
 #else
 # error "Unknown SH4 variant"
 #endif