wimax/i2400m: when bootstrap fails, reinitialize the bootrom

When a device reset happens during firmware load [in
i2400m_dev_bootstrap()], __i2400m_dev_start() will retry a number of
times. However, for those retries to be able to accomplish anything,
the device's bootrom has to be reinitialized.

Thus, on the retry path, pass the I2400M_MAC_REINIT to the firmware
load code.

Signed-off-by: Cindy H Kao <cindy.h.kao@intel.com>