video: consolidate splash screen alignment code

Code for checking "splashpos" environment variable is
duplicated in drivers, move it to the common function.
Call this function also in the bmp display command to
consider "splashpos" settings.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Acked-by: Otavio Salvador <otavio@ossystems.com.br>
diff --git a/common/splash.c b/common/splash.c
index c744497..18885f1 100644
--- a/common/splash.c
+++ b/common/splash.c
@@ -20,6 +20,7 @@
  *
  */
 
+#include <common.h>
 #include <splash.h>
 
 int __splash_screen_prepare(void)
@@ -29,3 +30,27 @@
 
 int splash_screen_prepare(void)
 	__attribute__ ((weak, alias("__splash_screen_prepare")));
+
+
+#ifdef CONFIG_SPLASH_SCREEN_ALIGN
+void splash_get_pos(int *x, int *y)
+{
+	char *s = getenv("splashpos");
+
+	if (!s)
+		return;
+
+	if (s[0] == 'm')
+		*x = BMP_ALIGN_CENTER;
+	else
+		*x = simple_strtol(s, NULL, 0);
+
+	s = strchr(s + 1, ',');
+	if (s != NULL) {
+		if (s[1] == 'm')
+			*y = BMP_ALIGN_CENTER;
+		else
+			*y = simple_strtol(s + 1, NULL, 0);
+	}
+}
+#endif /* CONFIG_SPLASH_SCREEN_ALIGN */