wifi: rtw89: 8852b: fix definition of KIP register number

An incorrect definition caused DPK to fail to backup and
restore a set of KIP registers. Fixing this will improve
RX throughput from 902 to 997 Mbps.

Fixes: 5b8471a ("wifi: rtw89: 8852b: rfk: add DPK")
Signed-off-by: Kuan-Chung Chen <damon.chen@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20240621123617.6687-2-pkshih@realtek.com
(cherry picked from commit 2f35712ab82683554c660bc2456f05785835efbe)

drivers/net/wireless/realtek/rtw89/rtw8852b_rfk.c

@@ -20,7 +20,7 @@
 #define RTW8852B_RF_REL_VERSION 34
 #define RTW8852B_DPK_VER 0x0d
 #define RTW8852B_DPK_RF_PATH 2
-#define RTW8852B_DPK_KIP_REG_NUM 2
+#define RTW8852B_DPK_KIP_REG_NUM 3
 
 #define _TSSI_DE_MASK GENMASK(21, 12)
 #define ADDC_T_AVG 100