Add modules.builtin.modinfo to the kernel package, to support presence
testing using module aliases and printing module details with 'modinfo'.
With related kmodloader changes this adds ~2 KB to compressed image sizes.
root@OpenWrt:/# modinfo unix
name: unix
filename: (builtin)
alias: net-pf-1
license: GPL
root@OpenWrt:/# modprobe net-pf-1 && echo SUCCESS || echo FAIL
SUCCESS
Signed-off-by: Tony Ambardar <itugrok@yahoo.com>