arm64: dts: qcom: msm8998: Enumerate i2c controllers

msm8998 has a dozen i2c controllers which can be used to connect to board
specific peripherals.  Enumerate the controllers so that boards can wire
up as needed.

Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>
[bjorn: Renumbered labels on BLSP2 nodes]
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Signed-off-by: Andy Gross <andy.gross@linaro.org>