FastbootDevice::boot1_1 null pointer dereference

FastbootDevice::boot1_1 attempts to dereference a null pointer when the
boot_control_hal_ is not set. It needs a guard statement to prevent
that.

Test: Manually tested on device without BootControl.
Bug: 301682120
Change-Id: Id86bcb915c8e2857bda26f64738dd5b643048e98
1 file changed