[U-Boot] core ticks/timer code

[Mike Frysinger <vapier@gentoo.org>]

so if we were to document things, it should read like this:
 - CONFIG_SYS_HZ is required to be 1000
 - get_ticks() / get_tbclk() should be deprecated -- use get_timer() instead
 - get_timer(X) returns the number of milliseconds since the last call to 
reset_timer(), minus X (which is in milliseconds too)

is there any reason to keep ticks/tbclk around ?  looking at consumers of 
these functions, they seem to re-implement the get_timer() logic anyways.
-mike
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