CONFIG_CPU_SUBTYPE_SH7785 is not available for thedefaultarchitecture x86.
Result is shown for architecture sh

Support SH7785 processor

modulename: pci-sh7780.ko

and/or

setup-sh7785.ko

configname: CONFIG_CPU_SUBTYPE_SH7785

Processor sub-type selection
└─>Support SH7785 processor
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
source code:
/arch/sh/drivers/pci/

is selected by
CONFIG_SH_HIGHLANDER