Bluetooth: hci_sync: Introduce PTR_UINT/UINT_PTR macros

[ Upstream commit a1f6c3ae ]

This introduces PTR_UINT/UINT_PTR macros and replace the use of
PTR_ERR/ERR_PTR.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Stable-dep-of: acab8ff2 ("Bluetooth: ISO: Fix invalid context error")
Signed-off-by: Sasha Levin <sashal@kernel.org>