net: Kconfig: Add WLAN CLD debug entry

WLAN CLD driver uses this config to enable certain debug features.
Some of the debug features may affect performance or may compromise
on security. So this should only be enabled in debug builds.

Change-Id: I2cfe2e49f3b503b9ce82886f6eee5b4c0d93e0d6
Signed-off-by: Sameer Thalappil <sameert@codeaurora.org>