[msm]: Enable display driver by default for splash screen on 7627 & 8650

If rgb565 image is available in splash partition then display it
as splash screen.

On Linux, splash.img can be created as follows:
convert -depth 8 splash.png rgb:- | out/host/linux-x86/bin/rgb2565  > splash.img

Change-Id: I24b61cbc94af4bac14b9a49b030b59484a0b283e
diff --git a/dev/fbcon/fbcon.c b/dev/fbcon/fbcon.c
index 5aadb1f..1daca98 100644
--- a/dev/fbcon/fbcon.c
+++ b/dev/fbcon/fbcon.c
@@ -42,7 +42,7 @@
 
 static struct fbcon_config *config = NULL;
 
-#define RGB565_BLUE		0x001f
+#define RGB565_BLACK		0x0000
 #define RGB565_WHITE		0xffff
 
 #define FONT_WIDTH		5
@@ -179,7 +179,7 @@
 
 	switch (config->format) {
 	case FB_FORMAT_RGB565:
-		bg = RGB565_BLUE;
+		bg = RGB565_BLACK;
 		fg = RGB565_WHITE;
 		break;
 
@@ -191,7 +191,7 @@
 
 	fbcon_set_colors(bg, fg);
 
-	fbcon_clear();
+	//fbcon_clear();
 	fbcon_flush();
 
 	cur_pos.x = 0;