clk: keystone: add missing MODULE_LICENSE

A randconfig build showed that two clk modules have no license tag:

WARNING: modpost: missing MODULE_LICENSE() in drivers/clk/keystone/gate.o
see include/linux/module.h for more information
WARNING: modpost: missing MODULE_LICENSE() in drivers/clk/keystone/pll.o
see include/linux/module.h for more information

Add the appropriate information from the comment at the start of the
two files.

Signed-off-by: Arnd Bergmann <[e-mail]>
Acked-by: Santosh Shilimkar <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/keystone/gate.c

···
 }
 CLK_OF_DECLARE(keystone_gate_clk, "ti,keystone,psc-clock",
 					of_keystone_psc_clk_init);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Clock driver for Keystone 2 based devices");
+MODULE_AUTHOR("Murali Karicheri <[e-mail]>");
+MODULE_AUTHOR("Santosh Shilimkar <[e-mail]>");

drivers/clk/keystone/pll.c

···
 		pr_err("%s: error registering mux %s\n", __func__, clk_name);
 }
 CLK_OF_DECLARE(pll_mux_clock, "ti,keystone,pll-mux-clock", of_pll_mux_clk_init);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("PLL clock driver for Keystone devices");
+MODULE_AUTHOR("Murali Karicheri <[e-mail]>");
+MODULE_AUTHOR("Santosh Shilimkar <[e-mail]>");