Bluetooth: btintel_pcie: Fix potential race condition in firmware download

During firmware download, if an error occurs, interrupts must be
disabled, synchronized, and re-enabled before retrying the download.
This change ensures proper interrupt handling to prevent race
conditions.

Signed-off-by: Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>
Signed-off-by: Kiran K <kiran.k@intel.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>