vgsp: notify keepalive on registered notifier slots + 8GB demo guest

r864 ground truth while wedged: both the RC-watchdog channel (0x31415900)
and the X/GL channel (0x1000013) sit with their class2d notification
ARMED (u16 status 0xFFFF at notifier_pa + 0x3E = slot-3 struct status)
and nothing ever clears them (X notified=0 after 459 submissions), so
the guest krcWatchdog fires 'GPU is probably locked' every ~8.2 s and
the whole X/GL stack wedges (glxgears poll() never returns; late XOOM
death). Under the mirrored flow the watchdog ring reads go unreadable
(rc=-2), so the decode-time ack and the notify2d_va path both miss.
svc_notify2d_keepalive(): every pass, every GR channel with a registered
notifier PA, read slots 0..3; for each slot armed exactly 0xFFFF write
the zeroed 16-byte NvNotification and post the channel event - the same
effects as svc_notify_complete without any ring read. Also bump the
demo harness guest RAM to 8GB (launch_qemu_rootport.sh) to survive the
observed emulation-path allocation growth during accelerated runs.

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