image|kernel.bblass|module-init-tools: do not use depmod-2.6

Change to only depend on virtual/*/depmod.
Change all calls to only use depmod.
Do not install depmod as depmod-2.6
Bump PR in module-init-tools-cross.

Signed-off-by: Anders Darander <anders@chargestorm.se>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>