Bluetooth: Move missing dts entries logs to info message

If dts entries are missing, might be which are not required entry
for a SoC. Instead of logging them as error message moving them
to log messages.

Change-Id: I1e2d2e75ee3d5ee9533b12a634a694b9b1da9d08
Signed-off-by: Balakrishna Godavarthi <bgodavar@codeaurora.org>