ENGR00231581 BCH: fix the wrong data size macros in BCH

In the mx23/mx28, the DATA0_SIZE/DATAN_SIZE of the BCH's
HW_BCH_FLASH1LAYOUT0/HW_BCH_FLASH0LAYOUT1 should be the real
bytes length of the data chunk 0 and data chunk 1.

But in the mx6q/mx50, the DATA0_SIZE/DATAN_SIZE of the BCH's
HW_BCH_FLASH1LAYOUT0/HW_BCH_FLASH0LAYOUT1 should be multiple of 4 bytes.

this patch fixes the wrong macros.

Signed-off-by: Huang Shijie <b32955@freescale.com>