dt-bindings: Add IEI vendor prefix and IEI WT61P803 PUZZLE driver bindings

dt-bindings: Add IEI vendor prefix and IEI WT61P803 PUZZLE driver bindings

Add the IEI WT61P803 PUZZLE Device Tree bindings for MFD, HWMON and LED
drivers. A new vendor prefix is also added accordingly for
IEI Integration Corp.

Signed-off-by: Luka Kovacic <luka.kovacic@sartura.hr>
Signed-off-by: Pavo Banicevic <pavo.banicevic@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>
Cc: Robert Marko <robert.marko@sartura.hr>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://patch.msgid.link/20210824124438.14519-2-luka.kovacic@sartura.hr
[robh: fix warnings from current tools]
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>