OMAP: DSS2: VRAM: Fix early_param for vram

In commit 2b0d8c25 the __early_param is
replaced with the generic early_param. This patch fixes the parameter passing
for the vram.

Signed-off-by: Thomas Weber <weber@corscience.de>
[tomi.valkeinen@nokia.com: changed the commit prefix]
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>