ARM: keystone: remove declaration of unused functions

These two functions are neither defined nor referenced.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: NLokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: NTom Rini <trini@konsulko.com>

arch/arm/mach-keystone/include/mach/clock.h

@@ -126,8 +126,6 @@ void init_plls(void);
 void init_pll(const struct pll_init_data *data);
 struct pll_init_data *get_pll_init_data(int pll);
 unsigned long clk_get_rate(unsigned int clk);
-unsigned long clk_round_rate(unsigned int clk, unsigned long hz);
-int clk_set_rate(unsigned int clk, unsigned long hz);
 int get_max_dev_speed(int *spds);
 int get_max_arm_speed(int *spds);
 void pll_pa_clk_sel(void);