[U-Boot] Question about compile warnings of exynos clock

[Joonyoung Shim <jy0922.shim@samsung.com>]

Hi,

I found below compile warnings,

  CC      arch/arm/cpu/armv7/exynos/clock.o
arch/arm/cpu/armv7/exynos/clock.c: In function ?clock_get_periph_rate?:
arch/arm/cpu/armv7/exynos/clock.c:265:47: warning: array subscript is above array bounds [-Warray-bounds]
  struct clk_bit_info *bit_info = &clk_bit_info[peripheral];
                                               ^
arch/arm/cpu/armv7/exynos/clock.c:265:47: warning: array subscript is above array bounds [-Warray-bounds]

...
> static unsigned long exynos5_get_periph_rate(int peripheral)
> {
>         struct clk_bit_info *bit_info = &clk_bit_info[peripheral];
>

This can access out of bounds of clk_bit_info[] array from
exynos5_get_periph_rate(). The peripheral value comes from
enum periph_id but it gets out of count clk_bit_info[] array.

So, i don't think exynos5_get_periph_rate is working correctly.
Currently, exynos5_get_periph_rate is used by clock_get_periph_rate only
from get_pwm_clk.

Is it ongoing to work for generic api to get the clk freq? If not,
let's remove exynos5_get_periph_rate and clock_get_periph_rate.

Thanks.