Use arm-none-eabi toolchain as default for local build
Use arm-none-eabi toolchain as default for local build

Now, the arm-none-eabi toolchain is available is all chroot,
so ensure that the developers doing a local build using directly the
Makefile pick by default the same toolchain as the one used by the
automated build.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BUG=None
TEST=make BOARD=bds && make BOARD=link && make BOARD=adv

Change-Id: Ib9568cabed3ca77cfa5ebc60479025cbb330b024

gelraen/cros-ec,eatbyte/chromium-ec,fourier49/BIZ_EC,md5555/ec,thehobn/ec,gelraen/cros-ec,longsleep/ec,alterapraxisptyltd/chromium-ec,alterapraxisptyltd/chromium-ec,md5555/ec,thehobn/ec,md5555/ec,fourier49/BZ_DEV_EC,thehobn/ec,alterapraxisptyltd/chromium-ec,fourier49/BIZ_EC,fourier49/BIZ_EC,akappy7/ChromeOS_EC_LED_Diagnostics,eatbyte/chromium-ec,longsleep/ec,akappy7/ChromeOS_EC_LED_Diagnostics,eatbyte/chromium-ec,coreboot/chrome-ec,fourier49/BZ_DEV_EC,mtk09422/chromiumos-platform-ec,eatbyte/chromium-ec,fourier49/BZ_DEV_EC,mtk09422/chromiumos-platform-ec,fourier49/BIZ_EC,longsleep/ec,akappy7/ChromeOS_EC_LED_Diagnostics,akappy7/ChromeOS_EC_LED_Diagnostics,akappy7/ChromeOS_EC_LED_Diagnostics,fourier49/BZ_DEV_EC,alterapraxisptyltd/chromium-ec,coreboot/chrome-ec,gelraen/cros-ec,coreboot/chrome-ec,md5555/ec,mtk09422/chromiumos-platform-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,thehobn/ec,gelraen/cros-ec,mtk09422/chromiumos-platform-ec,longsleep/ec