meta-agl-bsp: Fix agl-refhw-h3 BBMASK definition
Use += with BBMASK definition to avoid over-writing other additions.
Bug-AGL: SPEC-3798
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: If6d5850e7dc07de56c2a6737634f0c0935ec2030
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/26065
Reviewed-by: Vasyl Vavrychuk <vasyl.vavrychuk@opensynergy.com>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>