sh: Generalize SH7786 PCIe support.

Previously this was only built in for Urquell boards, but the same
approach can be used on SDK7786 now that the mode pin reading is
supported, so make it generic to SH7786.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/boards/Kconfig

@@ -153,6 +153,7 @@ config SH_SDK7780
 config SH_SDK7786
 	bool "SDK7786"
 	depends on CPU_SUBTYPE_SH7786
+	select SYS_SUPPORTS_PCI
 	help
 	  Select SDK7786 if configuring for a Renesas Technology Europe
 	  SH7786-65nm board.