max1720x_battery: implement offset correction

Steps:
1. read register CoTRIM(0xEB)
2. write to COFF(0x2F) -CoTRIM / 2 (round up)
How to run:
1. adb shell 'echo 1 > /d/maxfg/current_offset'

Bug: 317315367
Change-Id: I9df46f13898846e6831562981e2c54242d678cf4
Signed-off-by: Jenny Ho <hsiufangho@google.com>
diff --git a/max_m5.h b/max_m5.h
index 9ec1b07..44e0dc0 100644
--- a/max_m5.h
+++ b/max_m5.h
@@ -52,6 +52,8 @@
 
 #define MAX_M5_RETRY_TIMES 	3
 
+#define MAX_M5_COTRIM	0xEB
+
 /** ------------------------------------------------------------------------ */
 
 /*