samples: tests: mimxrt1170_evk: avoid duplication in configuration

- Remove duplicated conf/.overlay configuration for
  mimmxrt1170_evk A and B revisions that have the same content.
- No change if .conf/.overlay have different content.

Signed-off-by: Andrej Butok <andrey.butok@nxp.com>

Author: butok

samples/drivers/adc/adc_dt/boards/mimxrt1170_evk_mimxrt1176_cm7_B.overlay renamed to samples/drivers/adc/adc_dt/boards/mimxrt1170_evk_mimxrt1176_cm7.overlay

@@ -36,15 +36,6 @@ Building the application for mimxrt1170_evk_cm7
    :goals: debug
    :west-args: --sysbuild
 
-Building the application for mimxrt1170_evkb_cm7
-================================================
-
-.. zephyr-app-commands::
-   :zephyr-app: samples/drivers/mbox_data/
-   :board: mimxrt1170_evkb_cm7
-   :goals: debug
-   :west-args: --sysbuild
-
 Building the application for lpcxpresso55s69_cpu1
 =================================================