sh: sh775x/titan fixes for irq header changes.

The following moves the creation of IPR interupts into setup-7750.c
and updates a few other things to make it all work after the "Drop
CPU subtype IRQ headers" commit. It boots and runs fine on my titan
board.

 - adds an ipr_idx to the ipr_data and uses a function in the subtype
   code to calculate the address of the IPR registers

 - adds a function to enable individual interrupt mode for externals
   in the subtype code and calls that from the titan board code
   instead of doing it directly.

 - I changed the shift in the ipr_data to be the actual # of bits to
   shift, instead of the numnber / 4 - made it easier to match with
   the manual.

Signed-off-by: Jamie Lenehan <lenehan@twibble.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/mm/Kconfig

@@ -104,6 +104,7 @@ comment "SH-4 Processor Support"
 config CPU_SUBTYPE_SH7750
 	bool "Support SH7750 processor"
 	select CPU_SH4
+	select CPU_HAS_IPR_IRQ
 	help
 	  Select SH7750 if you have a 200 Mhz SH-4 HD6417750 CPU.
 
@@ -119,15 +120,18 @@ config CPU_SUBTYPE_SH7750R
 	bool "Support SH7750R processor"
 	select CPU_SH4
 	select CPU_SUBTYPE_SH7750
+	select CPU_HAS_IPR_IRQ
 
 config CPU_SUBTYPE_SH7750S
 	bool "Support SH7750S processor"
 	select CPU_SH4
 	select CPU_SUBTYPE_SH7750
+	select CPU_HAS_IPR_IRQ
 
 config CPU_SUBTYPE_SH7751
 	bool "Support SH7751 processor"
 	select CPU_SH4
+	select CPU_HAS_IPR_IRQ
 	help
 	  Select SH7751 if you have a 166 Mhz SH-4 HD6417751 CPU,
 	  or if you have a HD6417751R CPU.
@@ -136,6 +140,7 @@ config CPU_SUBTYPE_SH7751R
 	bool "Support SH7751R processor"
 	select CPU_SH4
 	select CPU_SUBTYPE_SH7751
+	select CPU_HAS_IPR_IRQ
 
 config CPU_SUBTYPE_SH7760
 	bool "Support SH7760 processor"