Move Intel Broxton Whiskey Cove TMU driver to intel sub-directory
to improve readability.

While at it, spell BXT fully in the Kconfig and switch to select REGMAP.
Signed-off-by: Kate Hsuan <hpa@redhat.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210820110458.73018-3-andriy.shevchenko@linux.intel.comSigned-off-by: Hans de Goede <hdegoede@redhat.com>