Change read count to 255 in Master Write-Read Cmd

Currently for master write-read command, maxIPMIWriteReadSize is defined
to 144. But, as per spec there's no limit specified on maximum read
count. So making it to 255 to read fully.

Tested:
Works fine using ipmitool command
Before:
ipmitool -I lanplus -H 10.165.7.34 -C 17 -U root -P 0penBmc raw 6 0x52
busID SlaveAddress 0x91 0x00
// Unable to send RAW command (channel=0x0 netfn=0x6 lun=0x0 cmd=0x52
rsp=0xc9): Parameter out of range

After:
ipmitool -I lanplus -H 10.165.7.34 -C 17 -U root -P 0penBmc raw 6 0x52
busID SlaveAddress 0xff 0x00
// Success

Signed-off-by: Joshi-Mansi <mansi.joshi@linux.intel.com>
Change-Id: I29fb826418811d44cff1e60524572f81a0b8abff
diff --git a/apphandler.cpp b/apphandler.cpp
index 90818a9..cbf7fcf 100644
--- a/apphandler.cpp
+++ b/apphandler.cpp
@@ -88,7 +88,7 @@
 static constexpr const char* cmdMaskStr = "commandMask";
 static constexpr int base_16 = 16;
 #endif // ENABLE_I2C_WHITELIST_CHECK
-static constexpr uint8_t maxIPMIWriteReadSize = 144;
+static constexpr uint8_t maxIPMIWriteReadSize = 255;
 static constexpr uint8_t oemCmdStart = 192;
 static constexpr uint8_t oemCmdEnd = 255;
 static constexpr uint8_t invalidParamSelectorStart = 8;