bcm27xx: bcm2708: update defconfig

Enabled CONFIG_ALL_KMODS and ran make kernel_menuconfig against
bcm2708 to update defconfig.  Some of the removed symbols are
present in target/linux/generic/config-5.10 while others were
removed by the make target.

Signed-off-by: John Audia <graysky@archlinux.us>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com> (wrapped)