ENGR00264076-2 i.mx6:Add the CPU temperature support

The patch add the CPU thermal temperature support.
Use universal equation for all i.MX6 series SOCs.

Signed-off-by: Anson Huang <b20788@freescale.com>
Signed-off-by: Jason Liu <r64343@freescale.com>
mx6: fix compilation of read_temperature
sp: remove unused variables to keep MAKEALL clean

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
mx6_r: remove redundant declarations of WEAK_PULLUP/DOWN

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>