pci: layerscape: Add specific config entry for RC and EP mode driver

Add Root Complex and Endpoint mode specific config entries, such that
it's feasible to enable the RC and/or EP mode driver indepently.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/configs/ls1088aqds_defconfig b/configs/ls1088aqds_defconfig
index d06fafd..fa4ae1d 100644
--- a/configs/ls1088aqds_defconfig
+++ b/configs/ls1088aqds_defconfig
@@ -59,7 +59,7 @@
 CONFIG_PCI=y
 CONFIG_DM_PCI=y
 CONFIG_DM_PCI_COMPAT=y
-CONFIG_PCIE_LAYERSCAPE=y
+CONFIG_PCIE_LAYERSCAPE_RC=y
 CONFIG_DM_SCSI=y
 CONFIG_SYS_NS16550=y
 CONFIG_SPI=y