Make TWT wake interval 64 bit

As the TWT Wake Interval Mantissa is a 2-byte field and TWT Wake
Interval Exponent is a 5-bit field, Maximum TWT Wake Interval = 65,535 x
[2^31] microseconds. So make TWT wake inteval 64 bit to avoid overflow.

Bug: 296108122
Test: m
Change-Id: Ib4736a98f50abd1b8d63e3c5fa32b2c540bbcb0f
1 file changed