xtensa: make assembly-called functions static
z_mp_entry() and power_gate_exit() are only called from assembly code
in the same file, where they're defined. Make them "static" and add
an attribute to let the compiler know, that they aren't unused.
Signed-off-by:
Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
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