OMAP3: overo: increase linux partition to 8 MiB

Linux kernel at version 3.5 is about 3.5 MiB; test kernels for 3.10 exceed 4
MiB.  Prepare for future upgrades by increasing the NAND partition now.

Upstream-Status: Pending

Signed-off-by: Peter A. Bigot <pab@pabigot.com>
Backport patch required to allow mt9v032 module to be unloaded if
the camera is not installed.

Upstream-Status: Backport [317efce991620adc589b3005b9baed433dcb2a56]