hwmon: (ibmaem) fix checkpatch issues

fixed:
WARNING: please, no space before tabs
+{"power3_average", ^I  aem2_show_pcap_value,^IPOWER_AUX},$

Signed-off-by: Frans Meulenbroeks <fransmeulenbroeks@gmail.com>
Acked-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>