Revert "net: usb: rtl8150: use new tasklet API"

This reverts commit 88892dab which is
commit 1999ad32 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I69c9fbd5fada4d468c2d2f4713f36b0ff230a013
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>