Convert CONFIG_SH7751_PCI to Kconfig

This converts the following to Kconfig:
   CONFIG_SH7751_PCI

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/r2dplus_defconfig b/configs/r2dplus_defconfig
index 5a38b07..2beda3a 100644
--- a/configs/r2dplus_defconfig
+++ b/configs/r2dplus_defconfig
@@ -52,6 +52,7 @@
 CONFIG_RTL8139=y
 CONFIG_TULIP=y
 CONFIG_PCI=y
+CONFIG_SH7751_PCI=y
 CONFIG_SPECIFY_CONSOLE_INDEX=y
 CONFIG_DM_SERIAL=y
 CONFIG_SERIAL_RX_BUFFER=y