mx6cuboxi: Remove obsolete comment

We currently support various versions of Solidrun mx6 boards, so
remove the obsolete comment.

Reported-by: Jon Nettleton <jon.nettleton@gmail.com>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Stefano Babic <sbabic@denx.de>

board/solidrun/mx6cuboxi/mx6cuboxi.c

@@ -595,10 +595,6 @@ static void gpr_init(void)
 	writel(0x007F007F, &iomux->gpr[7]);
 }
 
-/*
- * This section requires the differentiation between Solidrun mx6 boards, but
- * for now, it will configure only for the mx6dual hummingboard version.
- */
 static void spl_dram_init(int width)
 {
 	struct mx6_ddr_sysinfo sysinfo = {