net: wireless: bcmdhd_xxx: remove SDIO debug IOVARs causing out of bounds

"sd_devreg" IOVAR can cause out of bounds access when user input
manipulated. Proposed fix is removing debug oriented IOVARs completely.

Signed-off-by: Insun Song <insun.song@broadcom.com>
Bug: 37622847
Change-Id: I8fc5111fe9d8d2c5d7ae5b1c24ae8e531113beae
CVE-2017-0824
Signed-off-by: Kevin F. Haggerty <haggertk@lineageos.org>