Put a copy of test binaries under build/${BOARD}
Put a copy of test binaries under build/${BOARD}

This puts a copy of test binaries at build/${BOARD}/test-*.bin. This way
it is easier for us to get all test binaries.

BUG=chrome-os-partner:19057
TEST='make tests' and check build/${BOARD}/test-*.bin
BRANCH=None

Change-Id: I8394cea6bee95f00fc01d725d2494ca5e222f47d
Signed-off-by: Vic Yang <5fd92abeee651458f98e2856f4f200ee971cee4d@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/49608
Reviewed-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>

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