clk: tegra: Export Tegra20 EMC kernel symbols

We're going to modularize Tegra EMC drivers and some of the EMC-clock
driver symbols need to be exported.

Signed-off-by: Dmitry Osipenko <[e-mail]>
Acked-by: Thierry Reding <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

drivers/clk/tegra/clk-tegra20-emc.c

···
 #include <linux/clk-provider.h>
 #include <linux/clk/tegra.h>
 #include <linux/err.h>
+#include <linux/export.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
···
 		emc->cb_arg = cb_arg;
 	}
 }
+EXPORT_SYMBOL_GPL(tegra20_clk_set_emc_round_callback);
 
 bool tegra20_clk_emc_driver_available(struct clk_hw *emc_hw)
 {
···
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(tegra20_clk_prepare_emc_mc_same_freq);