cnss_nl: Add new attributes for cld80211 attr list

CLD80211_ATTR_CMD and CLD80211_ATTR_CMD_TAG_DATA are the
new attributes that are allowed for cld80211 family msgs
CLD80211_ATTR_CMD has cld80211 vendor subcommand in it,
while CLD80211_ATTR_CMD_TAG_DATA has nested sub attributes
of specified sub command.

CRs-Fixed: 2635543
Change-Id: I86004891e382cae29230edc654d2f8da0ddcc61b
Signed-off-by: Vinay Gannevaram <vganneva@codeaurora.org>