soc: qcom: bgcom: increase retries as BG may take ~600us to wake-up

Increases no of retries to get BG  status  as it can take upto
600us to wake up after sleep.

Change-Id: Id92d41a13a1ca25020bf74e187f9a47fa2dd9d07
Signed-off-by: Arjun Singh <arsingh@codeaurora.org>