turnip: reset push descriptor set on command buffer reset
Otherwise it will store a pointer to already unmapped memory which
could lead to a crash in tu_CmdPushDescriptorSetWithTemplateKHR since
it tries to copy data from the old memory.
Fixes a crash with Zink's new lazy descriptor manager instroduced
in
bfdd1d8d
Signed-off-by: Danylo Piliaiev <dpiliaiev@igalia.com>
Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11137>