wandboard: Use HTTP for accessing Linux kernel and U-Boot git repos

wandboard: Use HTTP for accessing Linux kernel and U-Boot git repos

Quite often these days Git ports are blocked by firewalls
[this is especially true in corporate environment] so switching
to common HTTP(s) is a safe and pretty convenient move.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Stephan Hoffmann <sho@relinux.de>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Sergio Prado <sergio.prado@e-labworks.com>
Cc: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>