arm64: versal: Remove undocumented cadence,qspi compatible

Compatible string is not the part of dt-schema and also not used by U-Boot
or Linux that's why remove it completely.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/13ccfe6b447c426aad06edbf0b8e52fd1eb97ee3.1721054349.git.michal.simek@amd.com
diff --git a/arch/arm/dts/versal-mini-ospi.dtsi b/arch/arm/dts/versal-mini-ospi.dtsi
index 1abe44f..8735292 100644
--- a/arch/arm/dts/versal-mini-ospi.dtsi
+++ b/arch/arm/dts/versal-mini-ospi.dtsi
@@ -36,7 +36,7 @@
 		ranges;
 
 		ospi: spi@f1010000 {
-			compatible = "cadence,qspi", "cdns,qspi-nor";
+			compatible = "cdns,qspi-nor";
 			status = "okay";
 			reg = <0 0xf1010000 0 0x10000 0 0xc0000000 0 0x20000000>;
 			clock-names = "ref_clk", "pclk";