nvmem: bcm-ocotp: Add ACPI support to BCM OCOTP

Add ACPI support to bcm ocotp driver

This patch is based on Linux-4.20-rc7.

Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com>
Acked-by: Scott Branden <scott.branden@broadcom.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>