fix(datepicker): don't allow clicks on disabled cells in year and multi-year views

Doesn't allow users to click on disabled cells inside the calendar in the year and multi-year views.

Fixes #13446.

Author: crisbeto

src/lib/datepicker/multi-year-view.html

@@ -3,7 +3,6 @@
     <tr><th class="mat-calendar-table-header-divider" colspan="4"></th></tr>
   </thead>
   <tbody mat-calendar-body
-         allowDisabledSelection="true"
          [rows]="_years"
          [todayValue]="_todayYear"
          [selectedValue]="_selectedYear"

src/lib/datepicker/year-view.html

@@ -3,7 +3,6 @@
     <tr><th class="mat-calendar-table-header-divider" colspan="4"></th></tr>
   </thead>
   <tbody mat-calendar-body
-         allowDisabledSelection="true"
          [label]="_yearLabel"
          [rows]="_months"
          [todayValue]="_todayMonth"