i2c: qcom-geni: change i2c_master_hub to static

i2c_master_hub is only used in i2c-qcom-geni.c now,
change it to static.

Fixes: cacd9643 ("i2c: qcom-geni: add support for I2C Master Hub variant")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-qcom-geni.c

@@ -1025,7 +1025,7 @@ static const struct dev_pm_ops geni_i2c_pm_ops = {
 									NULL)
 };
 
-const struct geni_i2c_desc i2c_master_hub = {
+static const struct geni_i2c_desc i2c_master_hub = {
 	.has_core_clk = true,
 	.icc_ddr = NULL,
 	.no_dma_support = true,