pvr: Remove logic to set vk_device::alloc.

The field is being already set by vk_device_init().

Signed-off-by: Rajnesh Kanwal <rajnesh.kanwal@imgtec.com>
Reviewed-by: Frank Binns <frank.binns@imgtec.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@collabora.com>
Part-of: <!15768>
35 jobs for !15768 with staging/fix_alloc_assign in 5 minutes and 29 seconds (queued for 4 seconds)
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