dt-bindings: arm: sunxi: Correct the descriptions for Pine64 boards

dt-bindings: arm: sunxi: Correct the descriptions for Pine64 boards

Correct the descriptions of a few Pine64 boards and devices, according
to their official names used in the Pine64 wiki and on the official Pine64
website. [1][2][3]  This ensures consistency between the officially used
names and the names in the source code.

[1] https://wiki.pine64.org/wiki/PINE_A64
[2] https://wiki.pine64.org/wiki/PINE_H64
[3] https://pine64.org/devices/

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Cc: Marek Kraus <gamiee@pine64.org>
Signed-off-by: Dragan Simic <dsimic@manjaro.org>
Link: https://lore.kernel.org/r/84cd1c70863704e950ca4cadffc7d5367434e06b.1716768092.git.dsimic@manjaro.org
Signed-off-by: Chen-Yu Tsai <wens@csie.org>