ppc: qemu: Switch over to use DM ETH and PCI

At present the board supports non-DM version PCI and E1000 drivers.
Switch over to use DM ETH and PCI by:

- Rewrite the PCI address map functions using DM APIs
- Enable CONFIG_MISC_INIT_R to do the PCI initialization and
  address map
- Drop unnecessary ad-hoc config macros
- Remove board_eth_init() in the board codes

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/configs/qemu-ppce500_defconfig b/configs/qemu-ppce500_defconfig
index c528a68..4a4b369 100644
--- a/configs/qemu-ppce500_defconfig
+++ b/configs/qemu-ppce500_defconfig
@@ -11,7 +11,6 @@
 CONFIG_BOOTDELAY=1
 # CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_LAST_STAGE_INIT=y
-# CONFIG_MISC_INIT_R is not set
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_REGINFO=y
 CONFIG_CMD_BOOTZ=y
@@ -29,7 +28,10 @@
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_DM=y
 # CONFIG_MMC is not set
+CONFIG_DM_ETH=y
 CONFIG_E1000=y
+CONFIG_DM_PCI=y
+CONFIG_PCI_MPC85XX=y
 CONFIG_DM_SERIAL=y
 CONFIG_SYS_NS16550=y
 CONFIG_ADDR_MAP=y