Initialisation for the AT91... PIT if there is no kernel...

[oliver munz @ s p e a g]

This Patch fixes problems whit the AT91 PIT, if it should run whitout the 
kernel.

The new hal_delay_us() is tested and works reliable whit 32bit from <20us to 
 >130years. Shorter delay's will be some thing <20us at 48MHz MCK.

There are new #ifdef CYGBLD_HAL_ARM_AT91_TIMER_PIT ... statements in
timer_pit.c and timer_tc.c sources, because whitout it can go wrong - at 
least in on my thinkpad...

Oliver Munz 
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