clk: qcom: gcc-ipq5018: change some variable static

lpass_axim_clk_src and lpass_sway_clk_src are only
used in gcc-ipq5018.c now, change them to static.

Fixes: e3fdbef1 ("clk: qcom: Add Global Clock controller (GCC) driver for IPQ5018")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230816080113.1222352-1-yangyingliang@huawei.com


Signed-off-by: Bjorn Andersson <andersson@kernel.org>