Commit c24d1d96 ("sysinfo: adapt script after removal of deprecated fsl_otp
driver") introduced support to determine if a device is closed by checking
a new boolean property on the DT for the CC8X platforms, however the CC8M
platforms use the same mechanism. This commit modifies the sysinfo script to
check also the DT for the CC8M platforms.
https://jira.digi.com/browse/DEL-7263
Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>