soc: qcom: bgcom: change BG TWM firmware name

Blackghost TWM firmware name has been changed as
from META scripts the usage of firmware name having
more than 8 characters is not allowed.

Change-Id: I4c7b9091de68b9ef9a7f0750a01b26923c05299a
Signed-off-by: Protik Biswas <protbisw@codeaurora.org>