arc: add empty asm/processor.h to satisfy compilation of USB code

common/usb.c unconditionally includes <asm/processor.h>
And now to allow USB support on ARC boards we have to have that header.

Sig

arc: add empty asm/processor.h to satisfy compilation of USB code

common/usb.c unconditionally includes <asm/processor.h>
And now to allow USB support on ARC boards we have to have that header.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

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