Add hypervisor consoles (hvc)

Add /dev/hvc* devices, and add them to securetty. These
are required for ppc64 virtual consoles.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
ti-uim: Add new package

[Peter: wrap help text, use full git hash, fix file header, drop license file]
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>