samples: subsys: fs: littlefs: move stm32_blk.conf

Move stm32_blk.conf ouside of 'boards' as this folder is meant to
contain only board-specific devicetree overlays and Kconfig fragments.

Signed-off-by: Abderrahmane Jarmouni <[email protected]>

Author: JarmouniA

samples/subsys/fs/littlefs/sample.yaml

@@ -51,7 +51,7 @@ tests:
     build_only: true
     platform_allow: stm32h747i_disco/stm32h747xx/m7
     extra_args:
-      - EXTRA_CONF_FILE=boards/stm32_blk.conf
+      - EXTRA_CONF_FILE=stm32_blk.conf
       - CONF_FILE=prj_blk.conf
     extra_configs:
       - CONFIG_SDMMC_STM32_HWFC=y
@@ -75,7 +75,7 @@ tests:
     build_only: true
     platform_allow: stm32f746g_disco
     extra_args:
-      - EXTRA_CONF_FILE=boards/stm32_blk.conf
+      - EXTRA_CONF_FILE=stm32_blk.conf
       - CONF_FILE=prj_blk.conf
     extra_configs:
       - CONFIG_SDMMC_STM32_HWFC=y