boot: zephyr: add integration platforms to the allow list

The platforms that are listed as integration platforms in
the Zephyr boot sample need to be included in the platform
allow list, otherwise zephyr CI will throw an error. This
commit removes the common list of integration platforms and
adds integration platform entries in each test variant, in
accordance with the allow-list in each of the variants.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
diff --git a/boot/zephyr/sample.yaml b/boot/zephyr/sample.yaml
index d9fb54a..35b4f1e 100644
--- a/boot/zephyr/sample.yaml
+++ b/boot/zephyr/sample.yaml
@@ -1,34 +1,42 @@
 sample:
   description: mcuboot test build sample
   name: mcuboot
-common:
-  integration_platforms:
-    - nrf52840dk_nrf52840
-    - nrf52840dongle_nrf52840
 
 tests:
   sample.bootloader.mcuboot:
     tags: bootloader_mcuboot
     platform_allow: nrf52840dk_nrf52840 frdm_k64f
+    integration_platforms:
+      - nrf52840dk_nrf52840
   sample.bootloader.mcuboot.serial_recovery:
     extra_args: OVERLAY_CONFIG=serial_recovery.conf
     platform_allow:  nrf52840dk_nrf52840
+    integration_platforms:
+      - nrf52840dk_nrf52840
     tags: bootloader_mcuboot
   sample.bootloader.mcuboot.usb_cdc_acm_recovery:
     tags: bootloader_mcuboot
     platform_allow:  nrf52840dongle_nrf52840
+    integration_platforms:
+      - nrf52840dongle_nrf52840
   sample.bootloader.mcuboot.usb_cdc_acm_recovery_log:
     extra_args: OVERLAY_CONFIG=./usb_cdc_acm_log_recovery.conf
       DTC_OVERLAY_FILE=./boards/nrf52840_big.overlay
     platform_allow:  nrf52840dk_nrf52840
+    integration_platforms:
+      - nrf52840dk_nrf52840
     tags: bootloader_mcuboot
   sample.bootloader.mcuboot.single_slot:
     extra_args: OVERLAY_CONFIG=./single_slot.conf
       DTC_OVERLAY_FILE=./boards/nrf52840_single_slot.overlay
     platform_allow:  nrf52840dk_nrf52840
+    integration_platforms:
+      - nrf52840dk_nrf52840
     tags: bootloader_mcuboot
   sample.bootloader.mcuboot.qspi_nor_slot:
     extra_args: DTC_OVERLAY_FILE=./boards/nrf52840dk_qspi_nor_secondary.overlay
       OVERLAY_CONFIG="./boards/nrf52840dk_qspi_nor.conf;./boards/nrf52840dk_qspi_secondary_boot.conf"
     platform_allow: nrf52840dk_nrf52840
+    integration_platforms:
+      - nrf52840dk_nrf52840
     tags: bootloader_mcuboot