ARM: dts: socfpga: Add missing SDMMC reset

The SDMMC reset is missing from DT, so the reset manager cannot unreset
the SDMMC. Add the missing DT reset entry.

Signed-off-by: Tien Fong Chee <tien.fong.chee@intel.com>

arch/arm/dts/socfpga_arria10.dtsi

@@ -660,6 +660,7 @@
 			fifo-depth = <0x400>;
 			clocks = <&l4_mp_clk>, <&sdmmc_clk>;
 			clock-names = "biu", "ciu";
+			resets = <&rst SDMMC_RESET>;
 			status = "disabled";
 		};