time: move the CONFIG_SYS_TIMER_RATE handling to the compiler

CONFIG_SYS_TIMER_RATE might be a dynamic value, i.e. a function call
instead of a static value, thus it has to be evaluated at runtime. If it
is a static value, the compiler should be able to optimize the unused
branches out.

This will be needed for kirkwoods dynamic CONFIG_SYS_TCLK setting.

Cc: Pali Rohár <[email protected]>
Signed-off-by: Michael Walle <[email protected]>
Reviewed-by: Pali Rohár <[email protected]>
Reviewed-by: Stefan Roese <[email protected]>

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