xtensa: remove second cross stack trampoline
This removes _xstack_call1_* trampoline as we can simply use
callx4 to jump to the interrupt handler.
Signed-off-by: 
Daniel Leung <daniel.leung@intel.com>
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This removes _xstack_call1_* trampoline as we can simply use
callx4 to jump to the interrupt handler.
Signed-off-by: Daniel Leung <daniel.leung@intel.com>