deb: Do not start jailhouse automatically

deb: Do not start jailhouse automatically

When jailhouse is started automatically (relatively early) during the
boot, something in the user space reads from 0xf0000 (see below),
which is not allowed by Jailhouse memory map. So far it is not clear
what it is and what it tries to read. According to TX2 memory map,
nothing should be there.

    Unhandled data read at 0xf0000(1)

    FATAL: unhandled trap (exception class 0x24)
    Cell state before exception:
     pc: 0000007f9a22fb40   lr: 000000557e594360 spsr: 20000000     EL0