configs: tegra-common-post: make PXE and DHCP boot targets optional

Disabling the network related features in defconfig causes build to
fail so make them optional.

Tested-by: Andreas Westman Dorcsak <hedmoo@yahoo.com> # ASUS Grouper E1565
Tested-by: Svyatoslav Ryhel <clamor95@gmail.com> # LG P895 T30
Signed-off-by: Jonas Schwöbel <jonasschwoebel@yahoo.de>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
diff --git a/include/configs/tegra-common-post.h b/include/configs/tegra-common-post.h
index 2d50956..0d0965e 100644
--- a/include/configs/tegra-common-post.h
+++ b/include/configs/tegra-common-post.h
@@ -8,18 +8,30 @@
 #define __TEGRA_COMMON_POST_H
 
 #if IS_ENABLED(CONFIG_CMD_USB)
-# define BOOT_TARGET_USB(func) func(USB, usb, 0)
+#define BOOT_TARGET_USB(func) func(USB, usb, 0)
 #else
-# define BOOT_TARGET_USB(func)
+#define BOOT_TARGET_USB(func)
 #endif
 
+#if CONFIG_IS_ENABLED(CMD_DHCP) && CONFIG_IS_ENABLED(CMD_PXE)
+#define BOOT_TARGET_PXE(func) func(PXE, pxe, na)
+#else
+#define BOOT_TARGET_PXE(func)
+#endif
+
+#if CONFIG_IS_ENABLED(CMD_DHCP)
+#define BOOT_TARGET_DHCP(func) func(DHCP, dhcp, na)
+#else
+#define BOOT_TARGET_DHCP(func)
+#endif
+
 #ifndef BOOT_TARGET_DEVICES
 #define BOOT_TARGET_DEVICES(func) \
 	func(MMC, mmc, 1) \
 	func(MMC, mmc, 0) \
 	BOOT_TARGET_USB(func) \
-	func(PXE, pxe, na) \
-	func(DHCP, dhcp, na)
+	BOOT_TARGET_PXE(func) \
+	BOOT_TARGET_DHCP(func)
 #endif
 #include <config_distro_bootcmd.h>