sony-coconut: Added 16-bit color depth workaround

Hello everybody. I am the only contributor for the device sony-coconut (Sony Xperia Live With Walkman), previously known as @praticamentetilde. It seems due to negligence from my side that I forgot to add in my previous PR the 16-bit color depth workaround, which is definitely needed for this device to display proper colors.

P.S.: I know it has been a while since I contributed, but I just started out university and I have been quite busy.

device/linux-sony-coconut/APKBUILD

@@ -2,7 +2,7 @@
 
 pkgname="linux-sony-coconut"
 pkgver=3.4.0
-pkgrel=3
+pkgrel=4
 pkgdesc="Live with Walkman kernel fork"
 arch="armhf"
 _carch="arm"
@@ -81,7 +81,7 @@ package() {
 }
 
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