ARM: tegra: enable PCIe controller on p2771-0000

p2771-0000 has a couple of PCIe ports; one physically x4 desktop PCI
connector (which may run at x2 electrically, depending on the board
version and configuration) and a x1 connection to the M.2 slot (which may
not be active, depending on the board version and configuration). This
change enables those.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/include/configs/p2771-0000.h b/include/configs/p2771-0000.h
index 3ce7208..1f64405 100644
--- a/include/configs/p2771-0000.h
+++ b/include/configs/p2771-0000.h
@@ -28,6 +28,11 @@
 #define CONFIG_SYS_MMC_ENV_PART		2
 #define CONFIG_ENV_OFFSET		(-CONFIG_ENV_SIZE)
 
+/* PCI host support */
+#define CONFIG_PCI
+#define CONFIG_PCI_PNP
+#define CONFIG_CMD_PCI
+
 #include "tegra-common-post.h"
 
 /* Crystal is 38.4MHz. clk_m runs at half that rate */