video: fbdev: aty128fb: remove unused 'sdr_64'

Fix the following gcc warning:

drivers/video/fbdev/aty/aty128fb.c:337:36: warning: ‘sdr_64’ defined but
not used [-Wunused-const-variable=]
static const struct aty128_meminfo sdr_64 = {
^~~~~~

Reported-by: Hulk Robot <[e-mail]>
Signed-off-by: Jason Yan <[e-mail]>
Cc: Paul Mackerras <[e-mail]>
Cc: Daniel Vetter <[e-mail]>
Signed-off-by: Bartlomiej Zolnierkiewicz <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/video/fbdev/aty/aty128fb.c

···
 	.name = "128-bit SDR SGRAM (1:1)",
 };
 
-static const struct aty128_meminfo sdr_64 = {
-	.ML = 4,
-	.MB = 8,
-	.Trcd = 3,
-	.Trp = 3,
-	.Twr = 1,
-	.CL = 3,
-	.Tr2w = 1,
-	.LoopLatency = 17,
-	.DspOn = 46,
-	.Rloop = 17,
-	.name = "64-bit SDR SGRAM (1:1)",
-};
-
 static const struct aty128_meminfo sdr_sgram = {
 	.ML = 4,
 	.MB = 4,