tests: lib: sprintf: filter-out MCIMX7_M4 platform

Apparently the tests/lib/sprintf test requires more than 34kB
of code size, when building in MCIMX7_M4-based platforms. Such
platforms, however, only have 32kB of code memory, therefore,
we exclude them from this test.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>

tests/lib/sprintf/src/main.c

@@ -28,7 +28,7 @@
 #define DEADBEEF_PTR_STR       "0xdeadbeef"
 
 /*
- * A really long string (330 characters + NUL).
+ * A really long string (330 characters + NULL).
  * The underlying sprintf() architecture will truncate it.
  */
 #define REALLY_LONG_STRING		     \

tests/lib/sprintf/testcase.yaml

@@ -1,3 +1,4 @@
 tests:
   libraries.libc:
+    filter: not CONFIG_SOC_MCIMX7_M4
     tags: libc