chore: add new recipe to define HAL version usage

By default: -DUSE_HAL_DRIVER -DUSE_FULL_LL_DRIVER
To use HAL version2 add this recipe:
build.hal=-DUSE_HALV2_DRIVER

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Author: fpistm

cores/arduino/stm32/startup_stm32yyxx.S

@@ -1,5 +1,7 @@
+#if !defined(USE_HALV2_DRIVER)
 #include "stm32_def_build.h"
 
 #if defined(CMSIS_STARTUP_FILE)
 #include CMSIS_STARTUP_FILE
 #endif
+#endif /* !USE_HALV2_DRIVER */

platform.txt

@@ -65,7 +65,7 @@ compiler.objcopy.cmd=arm-none-eabi-objcopy
 compiler.elf2hex.cmd=arm-none-eabi-objcopy
 compiler.libraries.ldflags=
 
-compiler.extra_flags=-mcpu={build.mcu} {build.fpu} {build.float-abi} -DVECT_TAB_OFFSET={build.flash_offset} -DUSE_HAL_DRIVER -DUSE_FULL_LL_DRIVER -DEXTENDED_PIN_MODE -mthumb "@{build.opt.path}"
+compiler.extra_flags=-mcpu={build.mcu} {build.fpu} {build.float-abi} -DVECT_TAB_OFFSET={build.flash_offset} {build.hal} -DEXTENDED_PIN_MODE -mthumb "@{build.opt.path}"
 
 compiler.S.flags={compiler.extra_flags} -c -x assembler-with-cpp {compiler.stm.extra_include}
 
@@ -148,6 +148,7 @@ build.enable_virtio=
 build.peripheral_pins=
 build.startup_file=
 build.fpu=
+build.hal=-DUSE_HAL_DRIVER -DUSE_FULL_LL_DRIVER
 build.float-abi=
 build.flags.optimize=-Os
 build.flags.debug=-DNDEBUG