tests: fix typos and misnamed platforms

Various obsolote and misnamed platfomrs in test filters theat went
undetected for a while.

Fixes #41222

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
diff --git a/tests/posix/common/testcase.yaml b/tests/posix/common/testcase.yaml
index 4e105f4..d6c0448 100644
--- a/tests/posix/common/testcase.yaml
+++ b/tests/posix/common/testcase.yaml
@@ -6,11 +6,11 @@
 
 tests:
   portability.posix.common:
-    platform_exclude: nsim_sem_mpu_stack_guard nsim_em_mpu_stack_guard ehl_crb
+    platform_exclude: nsim_sem_mpu_stack_guard ehl_crb
     extra_configs:
       - CONFIG_NEWLIB_LIBC=n
   portability.posix.common.newlib:
-    platform_exclude: nsim_sem_mpu_stack_guard nsim_em_mpu_stack_guard ehl_crb
+    platform_exclude: nsim_sem_mpu_stack_guard ehl_crb
     filter: TOOLCHAIN_HAS_NEWLIB == 1
     extra_configs:
       - CONFIG_NEWLIB_LIBC=y
@@ -19,26 +19,26 @@
     extra_configs:
       - CONFIG_ARCMWDT_LIBC=y
   portability.posix.common.tls:
-    platform_exclude: nsim_sem_mpu_stack_guard nsim_em_mpu_stack_guard ehl_crb
+    platform_exclude: nsim_sem_mpu_stack_guard ehl_crb
     filter: CONFIG_ARCH_HAS_THREAD_LOCAL_STORAGE and CONFIG_TOOLCHAIN_SUPPORTS_THREAD_LOCAL_STORAGE
     extra_configs:
       - CONFIG_NEWLIB_LIBC=n
       - CONFIG_THREAD_LOCAL_STORAGE=y
       - CONFIG_MAIN_STACK_SIZE=1152
   portability.posix.common.tls.newlib:
-    platform_exclude: nsim_sem_mpu_stack_guard nsim_em_mpu_stack_guard ehl_crb
+    platform_exclude: nsim_sem_mpu_stack_guard ehl_crb
     filter: TOOLCHAIN_HAS_NEWLIB == 1 and CONFIG_ARCH_HAS_THREAD_LOCAL_STORAGE and CONFIG_TOOLCHAIN_SUPPORTS_THREAD_LOCAL_STORAGE
     extra_configs:
       - CONFIG_NEWLIB_LIBC=y
       - CONFIG_THREAD_LOCAL_STORAGE=y
       - CONFIG_MAIN_STACK_SIZE=1152
   portability.posix.common.nsim:
-    platform_allow: nsim_sem_mpu_stack_guard nsim_em_mpu_stack_guard
+    platform_allow: nsim_sem_mpu_stack_guard
     extra_configs:
       - CONFIG_NEWLIB_LIBC=n
       - CONFIG_TEST_HW_STACK_PROTECTION=n
   portability.posix.common.newlib.nsim:
-    platform_allow: nsim_sem_mpu_stack_guard nsim_em_mpu_stack_guard
+    platform_allow: nsim_sem_mpu_stack_guard
     filter: TOOLCHAIN_HAS_NEWLIB == 1
     extra_configs:
       - CONFIG_NEWLIB_LIBC=y