clk: imx: Select MXC_CLK for i.MX93 clock driver

Most of the i.MX clock generic API is built by selecting MXC_CLK.
Without it, the i.MX93 clock driver will fail to build:

aarch64-linux-gnu-ld: drivers/clk/imx/clk-imx93.o:
in function `imx93_clocks_probe': clk-imx93.c:(.text+0xa8):
undefined reference to `imx_obtain_fixed_clk_hw'

So fix this by selecting MXC_CLK for the CLK_IMX93.

Fixes: 24defbe1

 ("clk: imx: add i.MX93 clk")
Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/20220315082446.3120850-1-abel.vesa@nxp.com


Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>