[PATCH][PPC32] Move irq_desc[].status, IRQ_LEVEL bit setup to xilinx_pic.c

This patch applies to the kernel 2.6.11-rc3.
It moves the code that informs the kernel if the particular interrupt is edge triggered
or level sensitive from the board specific file to a "CONFIG_VIRTEX_II_PRO-specific" file.
Using old IRQ numbering in that code is also fixed.

Signed-off-by: Andrei Konovalov <redacted>