ARM: dts: vexpress: fix few unit address format warnings

This patch fixes the following set of warnings on vexpress platforms:

 sysreg@010000 simple-bus unit address format error, expected "10000"
 sysctl@020000 simple-bus unit address format error, expected "20000"
 i2c@030000 simple-bus unit address format error, expected "30000"
 aaci@040000 simple-bus unit address format error, expected "40000"
 mmci@050000 simple-bus unit address format error, expected "50000"
 kmi@060000 simple-bus unit address format error, expected "60000"
 kmi@070000 simple-bus unit address format error, expected "70000"
 uart@090000 simple-bus unit address format error, expected "90000"
 uart@0a0000 simple-bus unit address format error, expected "a0000"
 uart@0b0000 simple-bus unit address format error, expected "b0000"
 uart@0c0000 simple-bus unit address format error, expected "c0000"
 wdt@0f0000 simple-bus unit address format error, expected "f0000"

Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>