turnip/ci: drop CI_TRON_TIMEOUT__BOOT_CYCLE__MINUTES

It doesn't serve any purpose when `CI_TRON_TIMEOUT__BOOT_CYCLE__RETRIES`
is not set to 1 or more.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34899>

src/freedreno/ci/gitlab-ci.yml

@@ -448,7 +448,6 @@ a750-angle:
     - .test-angle
   timeout: 25m  # base runtime 10min total, 7min of testing
   variables:
-    CI_TRON_TIMEOUT__BOOT_CYCLE__MINUTES: 17
     CI_TRON_TIMEOUT__OVERALL__MINUTES: 20
     DEQP_SUITE: tu-angle
     HWCI_TEST_SCRIPT: ./install/deqp-runner.sh
@@ -460,7 +459,6 @@ a750-gl:
     - .valve-freedreno-manual-rules
   timeout: 30m  # base runtime 11min total, 8min of testing
   variables:
-    CI_TRON_TIMEOUT__BOOT_CYCLE__MINUTES: 22
     CI_TRON_TIMEOUT__OVERALL__MINUTES: 25
     HWCI_TEST_SCRIPT: install/deqp-runner.sh
     DEQP_SUITE: freedreno-a750
@@ -487,7 +485,6 @@ a750-vk:
     - .valve-turnip-manual-rules
   timeout: 75m  # base runtime 54min total, 51min of testing
   variables:
-    CI_TRON_TIMEOUT__BOOT_CYCLE__MINUTES: 65
     CI_TRON_TIMEOUT__OVERALL__MINUTES: 70
     DEQP_SUITE: freedreno-a750-vk
     HWCI_TEST_SCRIPT: ./install/deqp-runner.sh
@@ -500,7 +497,6 @@ a750-vkd3d:
   timeout: 15m  # base runtime 3min
   variables:
     CI_TRON_TIMEOUT__OVERALL__MINUTES: 12
-    CI_TRON_TIMEOUT__BOOT_CYCLE__MINUTES: 10
     HWCI_TEST_SCRIPT: install/vkd3d-runner.sh
     GPU_VERSION: freedreno-a750
     FDO_CI_CONCURRENT: 1

src/gallium/drivers/zink/ci/gitlab-ci.yml

@@ -192,7 +192,6 @@ zink-tu-a750:
     - .test-piglit
   timeout: 25m  # base runtime 11min total, 9min of testing
   variables:
-    CI_TRON_TIMEOUT__BOOT_CYCLE__MINUTES: 18
     CI_TRON_TIMEOUT__OVERALL__MINUTES: 20
     DEQP_SUITE: zink-tu-a750
     GPU_VERSION: zink-tu-a750