configs: lx2160a: Enable CONFIG_PCIE_LAYERSCAPE_GEN4

LX2160A-Rev1 uses PCIe layerscape Gen4 controller.
Enable CONFIG_PCIE_LAYERSCAPE_GEN4 for lx2160a.

Signed-off-by: Wasim Khan <wasim.khan@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/configs/lx2160ardb_tfa_defconfig b/configs/lx2160ardb_tfa_defconfig
index 5a9e2e7..a82f14e 100644
--- a/configs/lx2160ardb_tfa_defconfig
+++ b/configs/lx2160ardb_tfa_defconfig
@@ -70,6 +70,7 @@
 CONFIG_DM_PCI=y
 CONFIG_DM_PCI_COMPAT=y
 CONFIG_PCIE_LAYERSCAPE_RC=y
+CONFIG_PCIE_LAYERSCAPE_GEN4=y
 CONFIG_DM_RTC=y
 CONFIG_RTC_PCF2127=y
 CONFIG_DM_SCSI=y