clk: qcom: nsscc-qca8k: Fix the MDIO functions undefined issue

The clock controller driver of QCA8K depends on MDIO_BUS because
of mdio_module_driver used to register the driver.

This patch fixes the following undefined symbols.
ERROR: modpost: "mdio_driver_register"
[drivers/clk/qcom/nsscc-qca8k.ko] undefined!
ERROR: modpost: "mdio_driver_unregister"
[drivers/clk/qcom/nsscc-qca8k.ko] undefined!
ERROR: modpost: "__mdiobus_write"
[drivers/clk/qcom/nsscc-qca8k.ko] undefined!
ERROR: modpost: "__mdiobus_read"
[drivers/clk/qcom/nsscc-qca8k.ko] undefined!
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202406161634.B27sOs8B-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202406162047.QkUMa2fG-lkp@intel.com/Signed-off-by: Luo Jie <quic_luoj@quicinc.com>
Link: https://lore.kernel.org/r/20240617093806.3461165-1-quic_luoj@quicinc.comSigned-off-by: Bjorn Andersson <andersson@kernel.org>

drivers/clk/qcom/Kconfig

@@ -255,7 +255,7 @@ config IPQ_GCC_9574
 
 config IPQ_NSSCC_QCA8K
 	tristate "QCA8K(QCA8386 or QCA8084) NSS Clock Controller"
-	depends on MDIO_BUS || COMPILE_TEST
+	depends on MDIO_BUS
 	help
 	  Support for NSS(Network SubSystem) clock controller on
 	  qca8386/qca8084 chip.