Kbuild: Always use $(PHASE_)

It is confusing to have both "$(PHASE_)" and "$(XPL_)" be used in our
Makefiles as part of the macros to determine when to do something in our
Makefiles based on what phase of the build we are in. For consistency,
bring this down to a single macro and use "$(PHASE_)" only.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/net/Makefile b/net/Makefile
index 7c917b3..41edbac 100644
--- a/net/Makefile
+++ b/net/Makefile
@@ -14,7 +14,7 @@
 obj-$(CONFIG_DM_DSA)   += dsa-uclass.o
 obj-$(CONFIG_CMD_LINK_LOCAL) += link_local.o
 obj-$(CONFIG_IPV6)     += ndisc.o
-obj-$(CONFIG_$(XPL_)DM_ETH) += net.o
+obj-$(CONFIG_$(PHASE_)DM_ETH) += net.o
 obj-$(CONFIG_IPV6)     += net6.o
 obj-$(CONFIG_CMD_NFS)  += nfs.o
 obj-$(CONFIG_CMD_PING) += ping.o
@@ -39,11 +39,11 @@
 endif
 
 ifeq ($(filter y,$(CONFIG_NET) $(CONFIG_NET_LWIP)),y)
-obj-$(CONFIG_$(XPL_)DM_ETH) += eth-uclass.o
+obj-$(CONFIG_$(PHASE_)DM_ETH) += eth-uclass.o
 obj-$(CONFIG_$(PHASE_)BOOTDEV_ETH) += eth_bootdev.o
 obj-$(CONFIG_DM_MDIO)  += mdio-uclass.o
 obj-$(CONFIG_DM_MDIO_MUX) += mdio-mux-uclass.o
-obj-$(CONFIG_$(XPL_)DM_ETH) += eth_common.o
+obj-$(CONFIG_$(PHASE_)DM_ETH) += eth_common.o
 obj-y += net-common.o
 endif
 
diff --git a/net/lwip/Makefile b/net/lwip/Makefile
index 950c531..5df2225 100644
--- a/net/lwip/Makefile
+++ b/net/lwip/Makefile
@@ -1,6 +1,6 @@
 ccflags-y += -I$(srctree)/lib/lwip/lwip/src/include -I$(srctree)/lib/lwip/u-boot
 
-obj-$(CONFIG_$(SPL_)DM_ETH) += net-lwip.o
+obj-$(CONFIG_$(PHASE_)DM_ETH) += net-lwip.o
 obj-$(CONFIG_CMD_DHCP) += dhcp.o
 obj-$(CONFIG_CMD_DNS) += dns.o
 obj-$(CONFIG_CMD_PING) += ping.o