samples: usb: uvc: fix target sample filters for board specific overlays

Recent addition of UVC Video encoder added sample targets to the sample
without the proper filter to ensure twister didn't try to automatically
build the sample target.

Not all boards have the zephyr_h264enc and zephyr_h264enc in their
device tree.

Fixes #98275

Signed-off-by: David Leach <[email protected]>

Author: dleach02

samples/subsys/usb/uvc/sample.yaml

@@ -34,8 +34,8 @@ tests:
     extra_configs:
       - CONFIG_VIDEO_ENCODER_H264=y
     extra_args:
-      - EXTRA_DTC_OVERLAY_FILE="app_h264enc.overlay"
-      - SHIELD=st_b_cams_imx_mb1854
+      - platform:stm32n6570_dk/stm32n657xx/sb:EXTRA_DTC_OVERLAY_FILE="app_h264enc.overlay"
+      - platform:stm32n6570_dk/stm32n657xx/sb:SHIELD=st_b_cams_imx_mb1854
     filter: dt_chosen_enabled("zephyr,camera")
     integration_platforms:
       - stm32n6570_dk/stm32n657xx/sb
@@ -46,8 +46,8 @@ tests:
     extra_configs:
       - CONFIG_VIDEO_ENCODER_JPEG=y
     extra_args:
-      - EXTRA_DTC_OVERLAY_FILE="app_jpegenc.overlay"
-      - SHIELD=st_b_cams_imx_mb1854
+      - platform:stm32n6570_dk/stm32n657xx/sb:EXTRA_DTC_OVERLAY_FILE="app_jpegenc.overlay"
+      - platform:stm32n6570_dk/stm32n657xx/sb:SHIELD=st_b_cams_imx_mb1854
     filter: dt_chosen_enabled("zephyr,camera")
     integration_platforms:
       - stm32n6570_dk/stm32n657xx/sb