tests: Move EDID test header to include/tests/lib

Move header to path with all other test headers to make include paths
unambigous.

Change-Id: Ie2dbb055df658272424df95f58d84caaeba3fc8f
Signed-off-by: Jakub Czapiga <jacz@semihalf.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60969
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

tests/lib/edid-test.c

@@ -5,7 +5,7 @@
 #include <edid.h>
 #include <assert.h>
 #include <string.h>
-#include <lib/edid-test.h>
+#include <tests/lib/edid.h>
 
 struct test_state {
 	int data_size;