[TIMOB-27239] TextField padding property uses different units between Android and iOS

*Problem* Adding the same padding to a TextField on Android and iOS leads to different results. It seems that Android uses pixels beacuse on phones with different densities you have different sizes of padding using the same digit. Instead iOS uses dp (correctly beacuse default unit in tiapp.xml is dp). *Test case*

Execute below code

Padding (focus only on left and right beacuse top and bottom aren't working on iOS) is different between Android (smaller) and iOS (bigger).

$.win.open();

<Alloy>
	<Window id="win">
			<TextField id="field"/>
	</Window>
</Alloy>

"#win": {
	backgroundColor: 'black'
}

"#field": {
	height: Ti.UI.SIZE,
	width: Ti.UI.SIZE,
	top: 32,
	backgroundColor: 'red',
	padding: {
		top: 32,
		bottom: 32,
		right: 32,
		left: 32,
	},
	value: 'Test Test Test Test'
}