Add TW_QCOM_ATS_OFFSET flag to manually set time/date offset

Needed if no ats_ files are present on qcom device

Offset is the difference between the current time
and the time since_epoch

To calculate the offset in Android, the following expression
(from a root shell) can be used:
echo "$(( ($(date +%s) - $(cat /sys/class/rtc/rtc0/since_epoch)) ))"

Add 3 zeros to the output and use that in the TW_QCOM_ATS_OFFSET
flag in your BoardConfig.mk

For example, if the result of the calculation is 1642433544,
use 1642433544000 as the offset

Change-Id: I5d58125dffc3fdbfb76a5ffde4e27659376185f1

Android.mk

@@ -383,6 +383,9 @@ ifneq ($(TW_DEFAULT_LANGUAGE),)
 else
     LOCAL_CFLAGS += -DTW_DEFAULT_LANGUAGE=en
 endif
+ifneq ($(TW_QCOM_ATS_OFFSET),)
+	LOCAL_CFLAGS += -DTW_QCOM_ATS_OFFSET=$(TW_QCOM_ATS_OFFSET)
+endif
 ifneq ($(TW_CLOCK_OFFSET),)
 	LOCAL_CFLAGS += -DTW_CLOCK_OFFSET=$(TW_CLOCK_OFFSET)
 endif