sh: r2dplus: Switch to DM PCI driver

Add DT entry for the DM PCI driver, update board configs
and drop ad-hoc board init code for the PCI bus. Instead,
let the DM PCI driver initialize and operate the hardware.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/configs/r2dplus_defconfig b/configs/r2dplus_defconfig
index 51a8587..b2334af 100644
--- a/configs/r2dplus_defconfig
+++ b/configs/r2dplus_defconfig
@@ -25,5 +25,7 @@
 CONFIG_SYS_FLASH_CFI=y
 CONFIG_RTL8139=y
 CONFIG_PCI=y
+CONFIG_DM_PCI=y
+CONFIG_DM_PCI_COMPAT=y
 CONFIG_SCIF_CONSOLE=y
 CONFIG_USE_PRIVATE_LIBGCC=y