phy: rockchip-pcie: Use devm_clk_get_enabled() helper

phy: rockchip-pcie: Use devm_clk_get_enabled() helper

Use devm_clk_get_enabled() instead of devm_clk_get() to make the code
cleaner and avoid calling clk_disable_unprepare(), as this is exactly
what this function does. Use the dev_err_probe() helper to simplify
error handling during probe.

Refactor the mutex handling in the rockchip_pcie_phy_init() function
to improve code readability and maintainability. The goto statement has
been removed, and the mutex_unlock call is now directly within the
conditional block.

Return the result of reset_control_assert() function, with 0 indicating
success and an error code indicating failure

Signed-off-by: Anand Moon <linux.amoon@gmail.com>
Link: https://lore.kernel.org/r/20241012071919.3726-3-linux.amoon@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>