Bluetooth: hci_qca: Stop collecting memdump again for command timeout during SSR

Setting memdump state to idle prior to setting of callback function
pointer for command timeout to NULL,causing the issue.Now moved the
initialisation of memdump state to qca_setup().

Fixes: d841502c ("Bluetooth: hci_qca: Collect controller memory dump during SSR")
Signed-off-by: Venkata Lakshmi Narayana Gubba <gubbaven@codeaurora.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>