common: Drop CONFIG_POST_STD/ALT_LIST

These CONFIG options are not used anymore. CONFIG_POST_ALT_LIST just
causes CONFIG_POST_STD_LIST to be set and it causes tests.c to be
compiled. So just make compiling tests.c unconditional.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/post/Makefile b/post/Makefile
index 5f72708..afd4940 100644
--- a/post/Makefile
+++ b/post/Makefile
@@ -4,7 +4,7 @@
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 
 obj-y	+= post.o
-obj-$(CONFIG_POST_STD_LIST)	+= tests.o
+obj-y	+= tests.o
 
 obj-y += drivers/
 obj-$(CONFIG_PPC) += lib_powerpc/