thermal: broadcom: Remove ACPI support

Unlike DT framework, thermal-zones and its parameters can't be parsed
using ACPI framework. So that ACPI support is removed in this driver.

Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com>
Reported-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>