This patch removes the System Control Module read from
plat-omap/sram.c:is_sram_locked(). Instead, it uses the global system_reg
variable, which is initialized immediately prior to the SRAM init code.
This happens to fix the compile breakage on the current tree.
In the long term, is_sram_locked() probably should be moved out of
sram.c.
Boot-tested on N800.
Signed-off-by: Paul Walmsley <paul@pwsan.com> Signed-off-by: Tony Lindgren <tony@atomide.com>