hciattach: set flag to enable HCI reset on init

On some qca devices, correct setup of BT+WLAN co-existance requires
HCI reset being set at the start of power on sequence. Sending HCI
resets has no side effect.

Upstream-Status: Inappropriate [enable feature]
Change-Id: I71cb367d10d4d19d82b41af6a4a0b8b2f770f691

Signed-off-by: Rupesh Tatiya <rtatiya@codeaurora.org>