auxdisplay: cfag12864bfb: constify fb_fix_screeninfo and fb_var_screeninfo structures

These structures are only used to copy into other structures,
so declare them as const.

This issue was detected using Coccinelle and the following semantic patch:

@r disable optional_qualifier@
identifier i;
position p;
@@
static struct fb_fix_screeninfo i@p = { ... };

@ok@
identifier r.i;
expression e;
position p;
@@
e = i@p

@bad@
position p != {r.p,ok.p};
identifier r.i;
struct fb_fix_screeninfo e;
@@
e@i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
 struct fb_fix_screeninfo i = { ... };

The semantic patch for fb_var_screeninfo is analogous.
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>

drivers/auxdisplay/cfag12864bfb.c

@@ -37,7 +37,7 @@
 
 #define CFAG12864BFB_NAME "cfag12864bfb"
 
-static struct fb_fix_screeninfo cfag12864bfb_fix = {
+static const struct fb_fix_screeninfo cfag12864bfb_fix = {
 	.id = "cfag12864b",
 	.type = FB_TYPE_PACKED_PIXELS,
 	.visual = FB_VISUAL_MONO10,
@@ -48,7 +48,7 @@ static struct fb_fix_screeninfo cfag12864bfb_fix = {
 	.accel = FB_ACCEL_NONE,
 };
 
-static struct fb_var_screeninfo cfag12864bfb_var = {
+static const struct fb_var_screeninfo cfag12864bfb_var = {
 	.xres = CFAG12864B_WIDTH,
 	.yres = CFAG12864B_HEIGHT,
 	.xres_virtual = CFAG12864B_WIDTH,