x86: edison: Drop unneeded DM_PCI_COMPAT

None of the driver for Edison is using DM_PCI_COMPAT, hence drop it.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>