Provide incoming HCI buffer for BTstack #2165
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The current driver reserves a larger buffer for the BTstack Pre-Buffer in memory, but does not use it when receiving an HCI packet from CYW43 driver. As some BTstack events will use this buffer, this causes an out-of-bound write / crash with BTstack v1.6.2 or higher.
Note: the 4-byte CYW43 header implicitly provided a 3-byte pre-buffer, which worked for BTstack v1.6.1 and earlier. In BTstack v1.6.2, the pre-buffer was increased which causes this bug to unhide.
This replaces #2157 (comment)