samples: drivers: flash_shell does not run on stm32h745/m4 boards

Do not run the samples/drivers/flash_shell application on the
stm32h745i_disco//m4 as the flash controller is not supported yet
on the M4 core (only M7). Just like the nucleo stm32h745//m4
is excluded.
Also exclude stm32h7rs disco at the moment (still TODO).

Signed-off-by: Francois Ramu <[email protected]>

Author: FRASTM

samples/drivers/flash_shell/sample.yaml

@@ -9,6 +9,8 @@ tests:
     filter: CONFIG_FLASH_HAS_DRIVER_ENABLED
     platform_exclude:
       - nucleo_h745zi_q/stm32h745xx/m4
+      - stm32h7s78_dk
+      - stm32h745i_disco/stm32h745xx/m4
       - stm32h747i_disco/stm32h747xx/m4
       - gd32f350r_eval
       - arduino_portenta_h7/stm32h747xx/m4