arm64: dts: imx8mp-venice-gw71xx: fix TPM SPI frequency

The IMX8MPDS Table 37 [1] shows that the max SPI master read frequency
depends on the pins the interface is muxed behind with ECSPI2
muxed behind ECSPI2 supporting up to 25MHz.

Adjust the spi-max-frequency based on these findings.

[1] https://www.nxp.com/webapp/Download?colCode=IMX8MPIEC

Fixes: 1a8f6ff ("arm64: dts: imx8mp-venice-gw71xx: add TPM device")
Cc: [email protected]
Signed-off-by: Tim Harvey <[email protected]>
Link: https://lore.kernel.org/stable/20250523173723.4167474-1-tharvey%40gateworks.com
Signed-off-by: Shawn Guo <[email protected]>

Author: Gateworks

arch/arm64/boot/dts/freescale/imx8mp-venice-gw71xx.dtsi

@@ -70,7 +70,7 @@
 	tpm@1 {
 		compatible = "atmel,attpm20p", "tcg,tpm_tis-spi";
 		reg = <0x1>;
-		spi-max-frequency = <36000000>;
+		spi-max-frequency = <25000000>;
 	};
 };