config: Simplify task stack allocator init

Replace runtime checks with compile time assertions.  This makes the
INTERNAL_ERROR_BAD_STACK_HOOK obsolete.

spec/build/testsuites/sptests/grp.yml

@@ -226,8 +226,6 @@ links:
   uid: spfatal04
 - role: build-dependency
   uid: spfatal05
-- role: build-dependency
-  uid: spfatal06
 - role: build-dependency
   uid: spfatal09
 - role: build-dependency

spec/build/testsuites/sptests/spfatal06.yml

@@ -1,19 +0,0 @@
-SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
-build-type: test-program
-cflags: []
-copyrights:
-- Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
-cppflags: []
-cxxflags: []
-enabled-by: true
-features: c cprogram
-includes: []
-ldflags: []
-links: []
-source:
-- testsuites/sptests/spfatal06/init.c
-stlib: []
-target: testsuites/sptests/spfatal06.exe
-type: build
-use-after: []
-use-before: []