Merge "adbd: reduce the USB buffer sizes to 16k."

// We can't find out whether we have support for AIO on ffs endpoints until we submit a read.

static std::optional<bool> gFfsAioSupported;

// Not all USB controllers support operations larger than 16k, so don't go above that.

static constexpr size_t kUsbReadQueueDepth = 32;

static constexpr size_t kUsbReadSize = 8 * PAGE_SIZE;

static constexpr size_t kUsbReadSize = 4 * PAGE_SIZE;

static constexpr size_t kUsbWriteQueueDepth = 32;

static constexpr size_t kUsbWriteSize = 8 * PAGE_SIZE;

static constexpr size_t kUsbWriteSize = 4 * PAGE_SIZE;

static const char* to_string(enum usb_functionfs_event_type type) {

    switch (type) {