serial: pic32: simplify clk handling

struct pic32_sport::ref_clk is only set, but not read. That means we can
remove it. And when we do so, pic32_enable_clock() and
pic32_disable_clock() are simple wrappers around clk_prepare_enable()
and clk_disable_unprepare() respectively. So we can remove the former
two from the code and replace it by the latter two.

Signed-off-by: Jiri Slaby <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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