riscv: dts: thead: Enable BeagleV Ahead eMMC and microSD

Add emmc node properties for the eMMC device and add sdio0 node
properties for the microSD slot. Set the frequency for the sdhci
reference clock.
Signed-off-by: Drew Fustini <dfustini@baylibre.com>
Reviewed-by: Guo Ren <guoren@kernel.org>
Reviewed-by: Jisheng Zhang <jszhang@kernel.org>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>

arch/riscv/boot/dts/thead/th1520-beaglev-ahead.dts

@@ -48,6 +48,10 @@ &apb_clk {
 	clock-frequency = <62500000>;
 };
 
+&sdhci_clk {
+	clock-frequency = <198000000>;
+};
+
 &uart_sclk {
 	clock-frequency = <100000000>;
 };
@@ -56,6 +60,22 @@ &dmac0 {
 	status = "okay";
 };
 
+&emmc {
+	bus-width = <8>;
+	max-frequency = <198000000>;
+	mmc-hs400-1_8v;
+	non-removable;
+	no-sdio;
+	no-sd;
+	status = "okay";
+};
+
+&sdio0 {
+	bus-width = <4>;
+	max-frequency = <198000000>;
+	status = "okay";
+};
+
 &uart0 {
 	status = "okay";
 };