clk: qcom: Use setbits_le32() for qcom_gate_clk_en()

clk: qcom: Use setbits_le32() for qcom_gate_clk_en()

The other clock enable functions in clock-qcom.c use setbits_le32() to
read/modify/write the enable registers. Use the same for qcom_gate_clk_en()
to simplify the code a bit.

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Stephan Gerhold <stephan.gerhold@linaro.org>
Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
Reviewed-by: Casey Connolly <casey.connolly@linaro.org>
Link: https://lore.kernel.org/r/20250424-apq8016-clock-fixes2-v2-3-fcc371c9e45f@linaro.org
Signed-off-by: Casey Connolly <casey.connolly@linaro.org>