rtlwifi: Remove unused defines from base.h

#define RTL_TX_DESC_SIZE	32

#define RTL_TX_HEADER_SIZE	(RTL_TX_DESC_SIZE + RTL_TX_DUMMY_SIZE)

#define HT_AMSDU_SIZE_4K	3839

#define HT_AMSDU_SIZE_8K	7935

#define MAX_BIT_RATE_40MHZ_MCS15	300	/* Mbps */

#define MAX_BIT_RATE_40MHZ_MCS7		150	/* Mbps */

#define MAX_BIT_RATE_LONG_GI_1NSS_80MHZ_MCS9	390	/* Mbps */

#define MAX_BIT_RATE_LONG_GI_1NSS_80MHZ_MCS7	293	/* Mbps */

#define RTL_RATE_COUNT_LEGACY		12

#define RTL_CHANNEL_COUNT		14

#define FRAME_OFFSET_FRAME_CONTROL	0

#define FRAME_OFFSET_DURATION		2

#define FRAME_OFFSET_ADDRESS1		4