ipq40xx: fix up Linksys WHW01 board name, device definition

ipq40xx: fix up Linksys WHW01 board name, device definition

Update the board name defined in DTS to match online documentation and the
name encoded into factory firmware. This helps supports flashing firmware
factory images using 'sysupgrade'.

Original WHW01 device definition assumes the rootfs IMAGE_SIZE is 33 MB
instead of the correct 74 MB, and defines factory images which include
extra adjustments/padding that do not match OEM factory images and may
cause problems flashing. Update image size and build recipe to fix these.

Suggested-by: Wyatt Martin <wawowl@gmail.com>
Signed-off-by: Tony Ambardar <itugrok@yahoo.com>