tests: c lib: define tests in yaml file

Define all testcases in the yaml for consistency and issue parsing
them during setup.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

tests/lib/mem_alloc/testcase.yaml

@@ -1,22 +1,52 @@
 tests:
   libraries.libc.minimal.mem_alloc:
-    extra_args: CONF_FILE=prj.conf
     arch_exclude: posix
+    extra_args: CONF_FILE=prj.conf
     platform_exclude: twr_ke18f native_posix_64 nrf52_bsim
     tags: clib minimal_libc userspace
-  libraries.libc.newlib.mem_alloc:
-    min_ram: 16
-    extra_args: CONF_FILE=prj_newlib.conf
+    testcases:
+    - realloc
+    - free
+    - malloc_align
+    - memalloc_all
+    - calloc
+    - malloc
+    - memalloc_max
+    - reallocarray
+  libraries.libc.minimal.mem_alloc_negative_testing:
     arch_exclude: posix
+    extra_args: CONF_FILE=prj_negative_testing.conf
     platform_exclude: twr_ke18f native_posix_64 nrf52_bsim
+    tags: clib minimal_libc userspace
+    testcases:
+    - no_mem_realloc
+    - no_mem_malloc
+  libraries.libc.newlib.mem_alloc:
+    arch_exclude: posix
+    extra_args: CONF_FILE=prj_newlib.conf
     filter: TOOLCHAIN_HAS_NEWLIB == 1
+    min_ram: 16
+    platform_exclude: twr_ke18f native_posix_64 nrf52_bsim
     tags: clib newlib userspace
+    testcases:
+    - realloc
+    - free
+    - malloc_align
+    - memalloc_all
+    - calloc
+    - malloc
+    - memalloc_max
+    - reallocarray
   libraries.libc.newlib_nano.mem_alloc:
     extra_args: CONF_FILE=prj_newlibnano.conf
     filter: CONFIG_HAS_NEWLIB_LIBC_NANO
     tags: clib newlib userspace
-  libraries.libc.minimal.mem_alloc_negative_testing:
-    extra_args: CONF_FILE=prj_negative_testing.conf
-    arch_exclude: posix
-    platform_exclude: twr_ke18f native_posix_64 nrf52_bsim
-    tags: clib minimal_libc userspace
+    testcases:
+    - realloc
+    - free
+    - malloc_align
+    - memalloc_all
+    - calloc
+    - malloc
+    - memalloc_max
+    - reallocarray