test: Move env-test rule into test/

The Makefile rules for tests should be within test/Makefile so move the
'env' rule over.

Signed-off-by: Simon Glass <sjg@chromium.org>

Makefile

@@ -893,7 +893,6 @@ ifdef CONFIG_POST
 libs-y += post/
 endif
 libs-$(CONFIG_$(PHASE_)UNIT_TEST) += test/
-libs-$(CONFIG_UT_ENV) += test/env/
 libs-$(CONFIG_UT_OPTEE) += test/optee/
 libs-$(CONFIG_UT_FDT_OVERLAY) += test/fdt_overlay/
 

test/Makefile

@@ -19,6 +19,7 @@ obj-y += ut.o
 ifeq ($(CONFIG_XPL_BUILD),)
 obj-y += boot/
 obj-$(CONFIG_UNIT_TEST) += common/
+obj-$(CONFIG_UT_ENV) += env/
 obj-y += log/
 else
 obj-$(CONFIG_SPL_UT_LOAD) += image/