platform/x86: hp-wireless: reuse module_acpi_driver

There is a macro to register and unregister modules in simple cases,
Let's use it and clean up the driver.

Cc: Alex Hung <alex.hung@canonical.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Darren Hart (VMware) <dvhart@infradead.org>