drivers: console: gsm_mux: gsm_mux_state_str should be static
`gsm_mux_state_str` is only used internally and therefore
should be 'static'.
Signed-off-by: 
Yong Cong Sin <yongcong.sin@gmail.com>
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`gsm_mux_state_str` is only used internally and therefore
should be 'static'.
Signed-off-by: Yong Cong Sin <yongcong.sin@gmail.com>