arm/dt: lenok: display: Fix white banding in grayscale (gamma)

There is banding issue in grayscale. This issue is caused by Digital S-curve gamma.
To avoid this issue, we change the value of gray scale from 0 to 32.

Bug: 18942799
Change-Id: I964cb1bb04f912cc20d5489d68286eaa84eb584c
Signed-off-by: sol.yu <sol.yu@lge.com>
Signed-off-by: Devin Kim <dojip.kim@lge.com>

arch/arm/boot/dts/apq8026-lenok/apq8026-lenok-panel.dtsi

@@ -56,17 +56,17 @@
 					FF FF FF FF FF FF
 					FF FF FF FF FF FF /* Color Management 10*/
 					39 01 00 00 00 00 11 E1
-					3E 3A 46 4E 4E 46
-					3A 32 00 FC F0 E4
-					E4 F8 1C 38 /* digital gamma( S curve) R */
+					32 3C 46 48 4E 46
+					40 30 00 FB F1 EE
+					E2 F6 08 40 /* digital gamma( S curve) R */
 					39 01 00 00 00 00 11 E2
-					3E 3A 46 4E 4E 46
-					3A 32 00 FC F0 E4
-					E4 F8 1C 38 /* digital gamma( S curve) G */
+					32 3C 46 48 4E 46
+					40 30 00 FB F1 EE
+					E2 F6 08 40 /* digital gamma( S curve) G */
 					39 01 00 00 00 00 11 E3
-					3E 3A 46 4E 4E 46
-					3A 32 00 FC F0 E4
-					E4 F8 1C 38 /* digital gamma( S curve) B */
+					32 3C 46 48 4E 46
+					40 30 00 FB F1 EE
+					E2 F6 08 40 /* digital gamma( S curve) B */
 					05 01 00 00 00 00 01 35
 					05 01 00 00 00 00 01 29];
 		qcom,mdss-dsi-off-command = [05 01 00 00 00 00 01 28