Correct SPL uses of CMD_CLK

This converts 7 usages of this option to the non-SPL form, since there is
no SPL_CMD_CLK defined in Kconfig

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Sean Anderson <seanga2@gmail.com>
diff --git a/drivers/clk/imx/clk-imx8qm.c b/drivers/clk/imx/clk-imx8qm.c
index 7759dc6..b874915 100644
--- a/drivers/clk/imx/clk-imx8qm.c
+++ b/drivers/clk/imx/clk-imx8qm.c
@@ -16,7 +16,7 @@
 
 #include "clk-imx8.h"
 
-#if CONFIG_IS_ENABLED(CMD_CLK)
+#if IS_ENABLED(CONFIG_CMD_CLK)
 struct imx8_clks imx8_clk_names[] = {
 	{ IMX8QM_A53_DIV, "A53_DIV" },
 	{ IMX8QM_UART0_CLK, "UART0" },