kasan: rename test_kasan_module_init to kasan_test_module_init

kasan: rename test_kasan_module_init to kasan_test_module_init

After commit f7e01ab828fd ("kasan: move tests to mm/kasan/"), the test
module file is renamed from lib/test_kasan_module.c to
mm/kasan/kasan_test_module.c, in order to keep consistent, rename
test_kasan_module_init to kasan_test_module_init.

Link: https://lkml.kernel.org/r/20240205060925.15594-3-yangtiezhu@loongson.cn
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Acked-by: Marco Elver <elver@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>