libdrm: fix deadlock due to duplicated functions in libdrm-nvdc
libdrm: fix deadlock due to duplicated functions in libdrm-nvdc

The system libdrm and libdrm-nvdc both implement the libdrm interface,
but in some cases libdrm-nvdc would like to call back into the system
version. This works fine, but if the system version then tries to call
some helper function that also exists in libdrm-nvdc, things may not
work as expected (for example, deadlocks due to inconsistent locking
in the two libraries).

The solution to this problem is to make sure that the system libdrm
will call its own version of functions where it can, rather than
playing symbol roulette in the global tables. This is done by adding
the linker flag -Bsymbolic-functions, such as is done globally in
JetPack's Ubuntu.

madisongh/meta-tegra,madisongh/meta-tegra,madisongh/meta-tegra,madisongh/meta-tegra,madisongh/meta-tegra