wl1251: allocate space for firmware with vmalloc()

Earlier firmware was stored to a memory area allocated with kmalloc()
but finding a a contiguous area of memory long enough for the firmware is
very difficult in certain cases. better to allocate the memory for firmware
with vmalloc() instead and use a small buffer for DMA transfers.

Thanks to Eero Tamminen for the idea.

Signed-off-by: Kalle Valo <[email protected]>
Reviewed-by: Vidhya Govindan <[email protected]>
Signed-off-by: Luciano Coelho <[email protected]>
Signed-off-by: John W. Linville <[email protected]>

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