test: posix: c_lib_ext: reduce memory requirements for testsuite

Previously, these tests were part of tests/posix/common.
In an effort to tie feature tests to specific POSIX features
(Option Groups), these tests were moved to a separate suite in a
previous commit.

However, the memory requirements for the legacy
tests/posix/common testsuite were significantly higher while the
memory requirements for tests in tests/posix/c_lib_ext are
significantly lower.

Remove the minimum flash and ram requirements to run the test so
that it passes tests on the integration platform qemu_cortex_m0.

Signed-off-by: Chris Friedt <[email protected]>

Author: cfriedt

tests/posix/c_lib_ext/testcase.yaml

@@ -10,8 +10,6 @@ common:
     - simulation
   integration_platforms:
     - qemu_cortex_m0
-  min_flash: 64
-  min_ram: 32
 tests:
   portability.posix.c_lib_ext:
     extra_configs: