clk: imx: fix compile testing imxrt1050

Randconfig testing revealed multiple issues with this driver:

ERROR: modpost: missing MODULE_LICENSE() in drivers/clk/imx/clk-imxrt1050.o
ERROR: modpost: "imx_clk_hw_pllv3" [drivers/clk/imx/clk-imxrt1050.ko] undefined!
ERROR: modpost: "imx_clk_hw_pfd" [drivers/clk/imx/clk-imxrt1050.ko] undefined!

Export the necessary symbols from the core clk driver and add the
license and author tags. To find this type of problem more easily
in the future, also enable building on other platforms, as we do for
the other i.MX clk drivers.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20221215165836.2136448-1-arnd@kernel.org
Acked-by: Jesse Taube <Mr.Bossman075@gmail.com>
Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/imx/Kconfig

@@ -115,7 +115,7 @@ config CLK_IMX93
 
 config CLK_IMXRT1050
 	tristate "IMXRT1050 CCM Clock Driver"
-	depends on SOC_IMXRT
+	depends on SOC_IMXRT || COMPILE_TEST
 	select MXC_CLK
 	help
 	    Build the driver for i.MXRT1050 CCM Clock Driver

drivers/clk/imx/clk-imxrt1050.c

@@ -167,3 +167,7 @@ static struct platform_driver imxrt1050_clk_driver = {
 	},
 };
 module_platform_driver(imxrt1050_clk_driver);
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_AUTHOR("Jesse Taube <Mr.Bossman075@gmail.com>");
+MODULE_AUTHOR("Giulio Benetti <giulio.benetti@benettiengineering.com>");

drivers/clk/imx/clk-pfd.c

@@ -5,6 +5,7 @@
  */
 
 #include <linux/clk-provider.h>
+#include <linux/export.h>
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/err.h>
@@ -153,3 +154,4 @@ struct clk_hw *imx_clk_hw_pfd(const char *name, const char *parent_name,
 
 	return hw;
 }
+EXPORT_SYMBOL_GPL(imx_clk_hw_pfd);

drivers/clk/imx/clk-pllv3.c

@@ -6,6 +6,7 @@
 
 #include <linux/clk-provider.h>
 #include <linux/delay.h>
+#include <linux/export.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
 #include <linux/slab.h>
@@ -486,3 +487,4 @@ struct clk_hw *imx_clk_hw_pllv3(enum imx_pllv3_type type, const char *name,
 
 	return hw;
 }
+EXPORT_SYMBOL_GPL(imx_clk_hw_pllv3);