sna: Workaround issue with global glyph privates and shared ZaphodHeads

Under ZaphodHeads we end up with multple screens accessing the common
sna_glyph_key and so cause conflicting updates and erroneous references
into the screen-local texture atlases.

Two approaches can be tried here. Transition to a screen-specific
private key introduced with xorg-1.13, or to move the glyph cache (and
the rest of the gpu state tracker) down into the device private rather
than screen private. This is neither of those, but a workaround to avoid
reusing the incorrect entries from shared screens.

Reported-by: Stephen Liang <inteldriver@angrywalls.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=54707
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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