clk: meson: g12a: fix hifi typo in mali parent_names

Replace hihi by hifi in the mali parent_names of the g12a SoC family.

Fixes: 085a4ea9

 ("clk: meson: g12a: add peripheral clock controller")
Signed-off-by: Alexandre Mergnat <amergnat@baylibre.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>