ENGR00176812-11 mx6 sabreauto: remove section mismatch warning

ENGR00176812-11 mx6 sabreauto: remove section mismatch warning

Remove the followinig section mismatch warning
WARNING: vmlinux.o(.text+0x1bdf8): Section mismatch in
reference from the function gpmi_nand_platform_init() to
the (unknown reference) .init.data:(unknown)
The function gpmi_nand_platform_init() references
the (unknown reference) __initdata (unknown).
This is often because gpmi_nand_platform_init lacks a __initdata
annotation or the annotation of (unknown) is wrong.

Signed-off-by: Lily Zhang <r58066@freescale.com>