clearfog: Fix eMMC access

This HW sucks because there's no real detection of SD vs. eMMC models.
We pretty much prefer to use just one DTB for both variants of the µSOM,
hence this hack.

Change-Id: If7f3793a9464cbb1f405e197159f243228a077cf
diff --git a/board/czechlight/clearfog/czechlight-clearfog.dts b/board/czechlight/clearfog/czechlight-clearfog.dts
index ef1bdb9..6c8986d 100644
--- a/board/czechlight/clearfog/czechlight-clearfog.dts
+++ b/board/czechlight/clearfog/czechlight-clearfog.dts
@@ -32,6 +32,13 @@
 			/* SPI1 CS2 */
 			MBUS_ID(0x01, 0x9a) 0 0xd0000000 0x4000000
 			>;
+
+		internal-regs {
+			sdhci@d8000 {
+				/delete-property/ cd-gpios;
+				broken-cd;
+			};
+		};
 	};
 };