site/powerpc-common: remove the incorrect dlopen default setting
These two setting for dlopen is not correct. dlopen is not available in libc,
instead it is provided by libdl. so the setting should not be "yes" by default.
This fixes [YOCTO #736] [YOCTO #737]
Thanks Richard for pointing out the root cause.
CC: Richard Purdie <richard.purdie@linuxfoundation.org> CC: Philip Balister <philip@balister.org> CC: Koen Kooi <koen@dominion.thruhere.net> Signed-off-by: Yu Ke <ke.yu@intel.com>
