Bluetooth: Fix errors found with clang ToT

Fix some of the errors found with clang ToT.

system/gd/common/strings.cc:51:15: error: no member named
'find_if_not' in namespace 'std'

bt/system/gd/hci/hci_layer.h:139:27: error: unqualified call
to std::move [-Werror,-Wunqualified-std-cast-call]

The failure was noticed in ChromeOS tot llvm builds where this
repo is imported.

Bug: 228085014
Test: errors are fixed

Change-Id: I53bf7870ec6294d82f901affbdabf9c4f2b6d9ac