oniro-linux.conf: Remove the python3-pyyaml preferred version

This was needed for meta-homeassistant and now that we have moved this
out of the main oniro repository, we can also drop this fix which will
be included in the meta-oniro-blueprint repository.

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

meta-oniro-core/conf/distro/oniro-linux.conf

@@ -114,9 +114,6 @@ PREFERRED_PROVIDER_virtual/kernel_qemuarm64 = "linux-oniro"
 PREFERRED_PROVIDER_virtual/kernel_qemux86 = "linux-oniro"
 PREFERRED_PROVIDER_virtual/kernel_qemux86-64 = "linux-oniro"
 
-# https://booting.oniroproject.org/distro/oniro/-/issues/187
-PREFERRED_VERSION_python3-pyyaml = "5.3"
-
 # Default to enabling serial debug console on RaspberryPi
 ENABLE_UART ?= "1"