cnss: Clean preallocation memory table after WLAN driver load fails

When WLAN driver load fails, check if there is any memory leak and also
clean the preallocation memory table to avoid further damage.

Change-Id: I13ce69700620165e8aae172e2683dc88e6707bfa
CRs-fixed: 755211
Signed-off-by: Yue Ma <yuem@codeaurora.org>