drm/panfrost: Use upper/lower_32_bits helpers

Use upper_32_bits/lower_32_bits helpers instead of open-coding them.
This is easier to scan quickly compared to bitwise manipulation, and it
is pleasingly symmetric. I noticed this when debugging lock_region,
which had a particularly "creative" way of writing upper_32_bits.

v2: Use helpers for one more call site and add review tag (Steven).

Signed-off-by: Alyssa Rosenzweig <[email protected]>
Reviewed-by: Rob Herring <[email protected]> (v1)
Reviewed-by: Steven Price <[email protected]>
Signed-off-by: Steven Price <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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