kernel_patch_verify: Drop namespace check

namespace check has been dropped since 2020 kernel commit 7dfbea4c468c
("scripts: remove namespace.pl"). Drop the same.

Signed-off-by: Nishanth Menon <nm@ti.com>

kernel_patch_verify

@@ -302,10 +302,6 @@ btest_stack() {
  kmake checkstack 1>&2
 }
 
-btest_namespace() {
- kmake namespacecheck 1>&2
-}
-
 btest_include() {
  kmake_single includecheck 1>&2
 }
@@ -344,7 +340,7 @@ tests_start() {
  if [ -n "$COMPLETE_TESTS" ]; then
  TESTS_ALL_SET="$TESTS_ALL_SET build_all"
  if [ $UBOOT_TESTING -eq 0 ]; then
- TESTS_ALL1_SET="btest_stack btest_namespace btest_include"
+ TESTS_ALL1_SET="btest_stack btest_include"
  fi
  fi
  echo "Sequential tests to run: $TESTS_ALL_SET"