fpga: xilinx-pr-decoupler: Use devm_clk_get_prepared()

The driver keeps the "aclk" clock prepared but disabled in its idle
state, toggling only the atomic clk_enable()/clk_disable() around
register accesses in the bridge enable_set/enable_show callbacks.

At probe time this was open-coded as clk_prepare_enable() immediately
followed by clk_disable(), leaving the clock prepared, with a matching
clk_unprepare() in the error path and in remove().

devm_clk_get_prepared() expresses exactly this: it gets and prepares the
clock and unprepares it automatically on driver detach.

Use it to drop the manual prepare/disable dance, the error-path
unprepare, and the now-empty clock teardown in remove().

Signed-off-by: Michal Simek <michal.simek@amd.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Reviewed-by: Xu Yilun <yilun.xu@intel.com>
Link: https://lore.kernel.org/r/8ca8ee5ba720b608a41f842d2b743302e5500ad0.1782205286.git.michal.simek@amd.com
Signed-off-by: Xu Yilun <yilun.xu@linux.intel.com>

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