defining the main clock frequency of AT91 boards

[Björn König]

Hello,

I would like to have a preprocessor definition called AT91C_MAIN_CLOCK
that allows you to specify the main clock frequency of a board in the
kernel configuration file. It avoids an intricate distinction of cases in
at91_pmc.c:395ff and you can use the unpatched source code with boards
that have a different quartz frequency than 10 or 16 MHz.

I attached a patch that deals with this issue. Users of TSC boards need to
add 'options AT91C_MAIN_CLOCK=16000000' to their kernel configuration
file.

Regards
Björn
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