[nrf fromtree] tests: kernel: timer: cycle64: Add support for GRTC

For GRTC timer a longer timeout is required:
(2 ^ 32) * 2 * 1us

Signed-off-by: Adam Kondraciuk <[email protected]>
(cherry picked from commit d0785ce)

Author: adamkondraciuk

tests/kernel/timer/cycle64/testcase.yaml

@@ -14,13 +14,21 @@ tests:
     tags:
       - kernel
       - timer
-    filter: CONFIG_TIMER_HAS_64BIT_CYCLE_COUNTER
+    filter: CONFIG_TIMER_HAS_64BIT_CYCLE_COUNTER and not CONFIG_NRF_GRTC_TIMER
     arch_exclude: posix
     timeout: 140
     slow: true
   kernel.timer.cycle64.fast:
     tags:
       - kernel
       - timer
-    filter: CONFIG_TIMER_HAS_64BIT_CYCLE_COUNTER
+    filter: CONFIG_TIMER_HAS_64BIT_CYCLE_COUNTER and not CONFIG_NRF_GRTC_TIMER
     arch_allow: posix
+  kernel.timer.cycle64.grtc:
+    tags:
+      - kernel
+      - timer
+    filter: CONFIG_TIMER_HAS_64BIT_CYCLE_COUNTER and CONFIG_NRF_GRTC_TIMER
+    arch_exclude: posix
+    timeout: 8600
+    slow: true