drivers: ipmi: Modify max length of IPMB packet

As per IPMB specification, maximum packet size supported is 255,
modified Max length to 240 from 128 to accommodate more data.
Signed-off-by: NVijay Khemka <vijaykhemka@fb.com>
Message-Id: <20191211190155.1279610-1-vijaykhemka@fb.com>
Signed-off-by: NCorey Minyard <cminyard@mvista.com>

drivers/char/ipmi/ipmb_dev_int.c

@@ -19,7 +19,7 @@
 #include <linux/spinlock.h>
 #include <linux/wait.h>
 
-#define MAX_MSG_LEN		128
+#define MAX_MSG_LEN		240
 #define IPMB_REQUEST_LEN_MIN	7
 #define NETFN_RSP_BIT_MASK	0x4
 #define REQUEST_QUEUE_MAX_LEN	256