Remove undefined CONFIG_ARCH_OMAP242X.
It boots on locked SRAM board.
Comment from Tony.
Additionally the #if defined(CONFIG_ARCH_OMAP242X) should not be
needed here. If not selected, the cpu_is_omapxxxx() functions
are if (0) {} functions and get optimized out.
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Tony Lindgren <tony@atomide.com>