nouveau: Fix alignment requirements on src and dst addresses
commit ce806a30 upstream. Linear copy works by adding the offset to the buffer address, which may end up not being 16-byte aligned. Some tests I've written for prime_pcopy show that the engine allows this correctly, so the restriction on lowest 4 bits of address can be lifted safely. The comments added were by envyas, I think because I used a newer version. Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com> [bwh: Backported to 3.2: no # prefixes in nva3_copy.fuc] Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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