xtensa: use callx0 opcode in fast_coprocessor
Instead of emulating call0 in fast_coprocessor use that opcode directly.
Use 'ret' instead of 'jx a0'.
Signed-off-by: 
Max Filippov <jcmvbkbc@gmail.com>
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Instead of emulating call0 in fast_coprocessor use that opcode directly.
Use 'ret' instead of 'jx a0'.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>