clk: imx: Select MXC_CLK for CLK_IMX8QXP

If the i.MX8QXP clock provider is built-in but the MXC_CLK is
built as module, build fails:

aarch64-linux-ld: drivers/clk/imx/clk-imx8-acm.o: in function `imx8_acm_clk_probe':
clk-imx8-acm.c:(.text+0x3d0): undefined reference to `imx_check_clk_hws'

Fix that by selecting MXC_CLK in case of CLK_IMX8QXP.

Fixes: c2cccb6d0b33 ("clk: imx: add imx8qxp clk driver")
Closes: https://lore.kernel.org/all/[e-mail]/
Reported-by: Randy Dunlap <[e-mail]>
Reviewed-by: Peng Fan <[e-mail]>
Acked-by: Randy Dunlap <[e-mail]>
Tested-by: Randy Dunlap <[e-mail]>
Signed-off-by: Abel Vesa <[e-mail]>

drivers/clk/imx/Kconfig

···
 	depends on (ARCH_MXC && ARM64) || COMPILE_TEST
 	depends on IMX_SCU && HAVE_ARM_SMCCC
 	select MXC_CLK_SCU
+	select MXC_CLK
 	help
 	  Build the driver for IMX8QXP SCU based clocks.