x86: dts: Add device tree compatible string for Intel IPC

Add this to the table so that it can be recognised.

Signed-off-by: Simon Glass <sjg@chromium.org>

include/fdtdec.h

@@ -96,6 +96,7 @@ enum fdt_compat_id {
 	COMPAT_NXP_PTN3460,		/* NXP PTN3460 DP/LVDS bridge */
 	COMPAT_SAMSUNG_EXYNOS_SYSMMU,	/* Exynos sysmmu */
 	COMPAT_PARADE_PS8625,		/* Parade PS8622 EDP->LVDS bridge */
+	COMPAT_INTEL_LPC,		/* Intel Low Pin Count I/F */
 
 	COMPAT_COUNT,
 };