tests: kernel: remove tickless scenario

Tickless kernel is default and has been for some time. This test is
actually testing PM and without proper setup it is doomed to fail on
various platforms where PM needs special considerations and hooks.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

tests/kernel/timer/timer_api/prj_tickless.conf

@@ -1,7 +0,0 @@
-CONFIG_ZTEST=y
-CONFIG_PM=y
-CONFIG_TICKLESS_KERNEL=y
-CONFIG_MP_MAX_NUM_CPUS=1
-CONFIG_TEST_RANDOM_GENERATOR=y
-
-CONFIG_TEST_USERSPACE=y

tests/kernel/timer/timer_api/testcase.yaml

@@ -4,21 +4,6 @@ tests:
       - kernel
       - timer
       - userspace
-  kernel.timer.tickless:
-    extra_args: CONF_FILE="prj_tickless.conf"
-    arch_exclude:
-      - nios2
-      - posix
-    platform_exclude:
-      - litex_vexriscv
-      - rv32m1_vega/openisa_rv32m1/zero_riscy
-      - rv32m1_vega/openisa_rv32m1/ri5cy
-      - nrf5340dk/nrf5340/cpunet
-    tags:
-      - kernel
-      - timer
-      - userspace
-      - pm
   kernel.timer.no_multitheading:
     tags:
       - kernel