clk: imx: Make CLK_IMX8ULP select MXC_CLK

Building CLK_IMX8ULP without selecting MXC_CLK causes the following
build errors:

ld: drivers/clk/imx/clk-imx8ulp.o: in function `imx8ulp_clk_cgc2_init':
clk-imx8ulp.c:(.text+0xd0): undefined reference to `imx_ccm_lock'
ld: clk-imx8ulp.c:(.text+0x14f): undefined reference to `imx_clk_hw_pllv4'
ld: clk-imx8ulp.c:(.text+0x15a): undefined reference to `imx_ccm_lock'

Avoid this problem by making CLK_IMX8ULP select MXC_CLK.

Fixes: c43a801 ("clk: imx: Add clock driver for imx8ulp")
Reported-by: Randy Dunlap <[email protected]>
Signed-off-by: Fabio Estevam <[email protected]>
Acked-by: Randy Dunlap <[email protected]>
Reviewed-by: Abel Vesa <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Abel Vesa <[email protected]>

drivers/clk/imx/Kconfig

@@ -102,5 +102,6 @@ config CLK_IMX8QXP
 config CLK_IMX8ULP
 	tristate "IMX8ULP CCM Clock Driver"
 	depends on ARCH_MXC || COMPILE_TEST
+	select MXC_CLK
 	help
 	    Build the driver for i.MX8ULP CCM Clock Driver