arm: dts: k3-am642-evm/sk: Enable OSPI support in SPL

Add bootph DT tags to enable OSPI in SPL.
Set OSPI regs for R5 SPL to address OSPI's boot region.

Signed-off-by: Jonathan Humphreys <j-humphreys@ti.com>
diff --git a/arch/arm/dts/k3-am642-evm-u-boot.dtsi b/arch/arm/dts/k3-am642-evm-u-boot.dtsi
index b843078..60b219c 100644
--- a/arch/arm/dts/k3-am642-evm-u-boot.dtsi
+++ b/arch/arm/dts/k3-am642-evm-u-boot.dtsi
@@ -182,3 +182,19 @@
 &cpsw_port2 {
 	status = "disabled";
 };
+
+&ospi0_pins_default {
+	bootph-all;
+};
+
+&fss {
+	bootph-all;
+};
+
+&ospi0 {
+	bootph-all;
+
+	flash@0 {
+		bootph-all;
+	};
+};