meta-zephyr-bsp: Add support for stm32f3-seco-d23

Add machine and BSP definitions for SECO JUNO (SBC-D23) for Zephyr v3.1.0.

Tested with MACHINE=stm32f3-seco-d23 bitbake zephyr-philosophers

Closes oniro#359

meta-zephyr-bsp/conf/machine/include/nrf52.inc

@@ -3,9 +3,7 @@
 
 #@DESCRIPTION: Machine configuration for Nordic Semiconductor nRF52xxx (Cortex-M4) SoC.
 
-require conf/machine/include/tune-cortexm4.inc
-
-TUNE_FEATURES = "armv7m cortexm4"
+require conf/machine/include/arm/armv7m/tune-cortexm4.inc
 
 # Target type for this machine used by Pyocd
 PYOCD_TARGET = "nrf52"