firehose: Increase reset delay after flashing

[ykaire-qti]

Added a 10-second reset delay after flashing to improve stability on RB3 and IQ9 platforms

Signed-off-by: Yvonne Kaire ykaire@qti.qualcomm.com

[JohnSagaQuic]

1. The 10-second delay occurs after flashing the image and before rebooting the device. Through extensive trial and error, we discovered that without a 5–7 second delay, the device may hang and require a full power cycle (disconnect and reconnect the power supply). To be safe, we implemented a 10-second delay for Rb3, IQ9.
2. PCAT also uses the same 10-second delay for the same stability reasons

[quic-bjorande]

The problem description is too vague, and the fix merely put band aid on a symptom. Please help derive a proper description of the problem.

Also, there's a stray "Update firehose.c" at the beginning of the commit message.