board: starfive: Rename spl_soc_init() to spl_dram_init()

Rename spl_soc_init() to spl_dram_init() because the generic function
name does not reflect what the function actually does. Also
spl_dram_init() is commonly used for dram initialization and should be
called from board_init_f().

Signed-off-by: Lukas Funke <lukas.funke@weidmueller.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/board/starfive/visionfive2/spl.c b/board/starfive/visionfive2/spl.c
index 45848db..ca61b5b 100644
--- a/board/starfive/visionfive2/spl.c
+++ b/board/starfive/visionfive2/spl.c
@@ -285,9 +285,9 @@
 
 	jh7110_jtag_init();
 
-	ret = spl_soc_init();
+	ret = spl_dram_init();
 	if (ret) {
-		debug("JH7110 SPL init failed: %d\n", ret);
+		debug("JH7110 DRAM init failed: %d\n", ret);
 		return ret;
 	}