[bazel] Use the SPI Flash based bootstrap for all func tests
[bazel] Use the SPI Flash based bootstrap for all func tests

Signed-off-by: Alphan Ulusoy <23b245cc5a07aacf75a9db847b24c67dee1707bf@google.com>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan