app: aboot: increase display kernel command line size

128 bytes length is not enough to store the dual-DSI panel arguments with
addition of topology configurations, simulator modes, pll source etc. for
kernel command line. Increase to 196 bytes to accommodate these needs.

Change-Id: Ibf239c8c15f424ebeffc76cd5992515db98566cb
diff --git a/app/aboot/aboot.c b/app/aboot/aboot.c
index 575e8e4..6799b53 100644
--- a/app/aboot/aboot.c
+++ b/app/aboot/aboot.c
@@ -132,7 +132,7 @@
 
 /* make 4096 as default size to ensure EFS,EXT4's erasing */
 #define DEFAULT_ERASE_SIZE  4096
-#define MAX_PANEL_BUF_SIZE 128
+#define MAX_PANEL_BUF_SIZE 196
 
 #define DISPLAY_DEFAULT_PREFIX "mdss_mdp"
 #define BOOT_DEV_MAX_LEN  64