MLK-10827 imx: mx6 update thermal driver according new equation

From IC guys:
"
After a thorough accuracy study of the Temp sense circuit,
we found that with our current equation, an average part can
read 7 degrees lower than a known forced temperature.
We also found out that the standard variance was around 2C;
which is the tightest distribution that we could create.
We need to change the temp sense equation to center the average
part around the target temperature.

Old Equation:
Temp = Troom,cal – slope*(Count measured – Count room fuse)
Where
Troom,cal = 25C  and
Slope = 0.4297157 – (0.0015974 * Count room fuse)

New Equation:
Temp = Troom,cal – slope*(Count measured – Count room fuse) +offset
Where
Troom,cal = 25C  and
Slope = 0.4445388 – (0.0016549 * Count room fuse)
Offset = 3.580661
"

According the new equation, update the thermal driver.
c1 and c2 changed to u64 type and update comments.

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>

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