rtlwifi: Remove unused defines from cam.h

#define CAM_CONTENT_COUNT				8

#define CFG_DEFAULT_KEY					BIT(5)

#define CFG_VALID					BIT(15)

#define PAIRWISE_KEYIDX					0

#define CAM_PAIRWISE_KEY_POSITION			4

#define	CAM_CONFIG_USEDK				1

#define	CAM_CONFIG_NO_USEDK				0

void rtl_cam_reset_all_entry(struct ieee80211_hw *hw);