Added support for main charger over voltage protection.
Signed-off-by: Rupesh Kumar <rupesh.kumar@stericsson.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> Reviewed-by: Philippe LANGLAIS <philippe.langlais@stericsson.com> Tested-by: Michel JAOUEN <michel.jaouen@stericsson.com>