mondrianwifi: wlan: Use built-in wlan instead of loading a module

Change-Id: I10a7c86b3f6125c4062fa041257a224c9e870aea
mondrianwifi: wlan: Cleanup firmware files

WCNSS_cfg.dat: From stock
WCNSS_qcom_cfg.ini: Version from v3.2.3.72 of prima driver
WCNSS_qcom_wlan_nv.bin: From stock

Change-Id: I78969fa412f7a86731bbc2dee77298113640cb9e