max1720x_battery: Cycle count needs to be positive

Conversion for signed 16 bit can yield negative cycle count.  Battery
cycle count should never be negative.  Switching to signed 32 bit for
calculation.

Bug: 188245977
Signed-off-by: George Lee <[email protected]>
Change-Id: If854ecadf873ff698c6925a4ee7f92b0670f25ae
1 file changed