Added 'host' device for various *_RUN_PLACEHOLDER because

Authored by Byoungro So <byoungro.so@intel.com> on Mar 23 2021, 1:29 PM.

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Added 'host' device for various *_RUN_PLACEHOLDER because
SYCL_DEVICE_FILTER won't automatically add it.

Also fixed some bugs of HOST/CPU/ACC_RUN_PLACEHOLDERS.
They should not be prefixed with {SYCL_PLUGIN}: because
these invalid BE:DEV_TYPE combination will end up being no
device available.

Signed-off-by: Byoungro So <byoungro.so@intel.com>