llext: Remove simple from llext test

The simple path and naming wasn't really right, there are no other tests
and the test suite has become quite automated and extensable to cover
most things we'd like to test with llext. Building, loading, and linking
of course.

Signed-off-by: Tom Burdick <[email protected]>

Author: teburd

tests/subsys/llext/simple/CMakeLists.txt renamed to tests/subsys/llext/CMakeLists.txt

@@ -3,10 +3,10 @@
 
 cmake_minimum_required(VERSION 3.20.0)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
-project(llext_simple_test)
+project(llext_test)
 
 target_sources(app PRIVATE
-  src/test_llext_simple.c
+  src/test_llext.c
 )
 
 target_include_directories(app PRIVATE