dt-bindings: Document correct and deprecated vendor-prefix with device isl29028

This patch documents the device isl29028 with its vendor-prefix. Undocumented deprecated vendor-prefix
found by checkpatch also documented for compatibility reasons.
Signed-off-by: Darshana Padmadas <darshanapadmadas@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Documentation/devicetree/bindings/i2c/trivial-devices.txt

@@ -56,6 +56,8 @@ gmt,g751		G751: Digital Temperature Sensor and Thermal Watchdog with Two-Wire In
 infineon,slb9635tt	Infineon SLB9635 (Soft-) I2C TPM (old protocol, max 100khz)
 infineon,slb9645tt	Infineon SLB9645 I2C TPM (new protocol, max 400khz)
 isl,isl12057		Intersil ISL12057 I2C RTC Chip
+isil,isl29028           (deprecated, use isl)
+isl,isl29028            Intersil ISL29028 Ambient Light and Proximity Sensor
 maxim,ds1050		5 Bit Programmable, Pulse-Width Modulator
 maxim,max1237		Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs
 maxim,max6625		9-Bit/12-Bit Temperature Sensors with I²C-Compatible Serial Interface