test: Add flash_write_protect to default tests
BRANCH=none
TEST=make BOARD=krane -j tests
# found in the LICENSE file.
# Device test binaries
-test-list-y ?= pingpong timer_calib timer_dos timer_jump mutex utils utils_str
+test-list-y ?= flash_write_protect pingpong timer_calib timer_dos timer_jump mutex utils utils_str
#disable: powerdemo
# Emulator tests
