platform/x86: intel-vbtn: Revert "Fix SW_TABLET_MODE always reporting 1 on the HP Pavilion 11 x360"

After discussion, see the Link tag, it appears that this is not good enough.
So, revert it now and apply a better fix.

This reverts commit d8233468

.

Link: https://lore.kernel.org/platform-driver-x86/s5hft71klxl.wl-tiwai@suse.de/
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>