ARM: dts: msm: set maximum buffer length to solve malloc failure

Memory allocations of order of 4 and upwards are not
recommended by memory team. Fix a maximum buffer length of
32KB instead of the MHI supported maximum of 64KB.

Change-Id: I4527390463032223e941777fea7f48446555c029
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>

arch/arm64/boot/dts/qcom/sdxprairie.dtsi

@@ -1059,6 +1059,7 @@
 		qcom,smmu-s1-enable;
 
 		mhi,max-channels = <30>;
+		mhi,buffer-len = <0x8000>;
 		mhi,timeout = <10000>;
 
 		mhi_channels {