[davinci] Fixed timeout detection in DAVINCI_IOCTL_WAIT_LOW.
[davinci] Fixed timeout detection in DAVINCI_IOCTL_WAIT_LOW.

- reduced polling frequency from 1/HZ sec to 1/50 sec with an allowed
  total of almost one second while still running the same command (DSP stuck)
- or timeout immediately (after 1/50 sec) if idle counter changed (DSP felt idle)

- enhanced queue dump on timeout
- disabled user space write combine on control structure (just one member written)

kevleyski/directfb,sklnet/DirectFB,dfbdok/DirectFB1,djbclark/directfb-core-DirectFB,sklnet/DirectFB,deniskropp/DirectFB,deniskropp/DirectFB,mtsekm/test,Distrotech/DirectFB,Distrotech/DirectFB,lancebaiyouview/DirectFB,kaostao/directfb,kaostao/directfb,djbclark/directfb-core-DirectFB,kaostao/directfb,dfbdok/DirectFB1,DirectFB/directfb,kevleyski/directfb,deniskropp/DirectFB,kevleyski/directfb,djbclark/directfb-core-DirectFB,Distrotech/DirectFB,mtsekm/test,kevleyski/DirectFB-1,sklnet/DirectFB,kevleyski/directfb,kevleyski/DirectFB-1,deniskropp/DirectFB,dfbdok/DirectFB1,sklnet/DirectFB,DirectFB/directfb,jcdubois/DirectFB,jcdubois/DirectFB,djbclark/directfb-core-DirectFB,lancebaiyouview/DirectFB,lancebaiyouview/DirectFB,kevleyski/DirectFB-1,mtsekm/test,DirectFB/directfb,jcdubois/DirectFB,lancebaiyouview/DirectFB,kevleyski/DirectFB-1