CONFIG_SH_R7780RP is not available for thedefaultarchitecture x86.
Result is shown for architecture sh

R7780RP-1

modulename: irq-r7780rp.ko

configname: CONFIG_SH_R7780RP

SuperH system type
└─>R7780RP-1
In linux kernel since version 2.6.16 (release Date: 2006-03-19)  
Select R7780RP-1 if configuring for a Renesas Solutions
HIGHLANDER board.