Bluetooth: btintel_pcie: Separate coredump work from RX work

Sharing a single workqueue between coredump processing and RX
delays evacuation of RX events while a coredump is in progress.
The firmware's RX buffers can overflow during that window, leading
to dropped events. The issue was observed in HID use cases where
HID reports arrive in bursts and quickly fill the RX path while a
coredump is being collected.

Move coredump processing to a dedicated ordered coredump_workqueue
with its own coredump_work, so coredumps run independently of RX.
All four coredump trigger sources (FW assert, HW exception, user
sysfs trigger, and resume-error detection) are switched to this new
workqueue. Ordering serialises concurrent triggers without blocking
RX.

Signed-off-by: Ravindra <ravindra@intel.com>
Signed-off-by: Kiran K <kiran.k@intel.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

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