Chip Icon should take same src prop as icon

[AVatch]

Feature Request

Ionic Info
Run ionic info from a terminal/cmd prompt and paste the output below.

Ionic:

   ionic (Ionic CLI)          : 4.0.3 (/usr/local/npm_packages/lib/node_modules/ionic)
   Ionic Framework            : @ionic/angular 4.0.0-beta.0
   @angular-devkit/core       : 0.7.0-rc.3
   @angular-devkit/schematics : 0.7.0-rc.3
   @angular/cli               : 6.0.8
   @ionic/ng-toolkit          : 1.0.0
   @ionic/schematics-angular  : 1.0.0

System:

   NodeJS : v10.7.0 (/usr/local/Cellar/node/10.7.0/bin/node)
   npm    : 6.2.0
   OS     : macOS High Sierra

Describe the Feature Request
ion-chip-icon should support similar props as ion-icon, mainly the src prop to support custom SVG icons.

Describe Preferred Solution
<ion-chip-icon src="/path/to/custom/icons.svg"></ion-chip-icon>

[ionitron-bot]

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