arm: mach-omap2: n8x0: clean up dummy onenand init
arm: mach-omap2: n8x0: clean up dummy onenand init

When OneNAND support is disabled, the platform code defines NULL
board_onenand_data and empty init function for us. By utilizing this we
can avoid cluttering board files with dummy definitions/wrappers.

Signed-off-by: Aaro Koskinen <13423a3f3006b5859cfceae66d59451f5eb4e205@nokia.com>
Signed-off-by: Tony Lindgren <1001e8702733cced254345e193c88aaa47a4f5de@atomide.com>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas