fix(imports): fix circular dep

Author: tishko0

projects/igniteui-angular/src/lib/grids/grid-public-row.ts

@@ -4,7 +4,7 @@ import { GridSummaryCalculationMode, GridSummaryPosition } from './common/enums'
 import { IgxGridCell } from './grid-public-cell';
 import { IgxSummaryResult } from './summaries/grid-summary';
 import { ITreeGridRecord } from './tree-grid/tree-grid.interfaces';
-import { IgxPivotGridComponent } from 'igniteui-angular';
+import { IgxPivotGridComponent } from './pivot-grid/pivot-grid.component';
 import { PivotUtil } from './pivot-grid/pivot-util';
 import { mergeWith } from 'lodash-es';
 import { CellType, GridServiceType, GridType, IGridValidationState, RowType, ValidationStatus } from './common/grid.interface';

projects/igniteui-angular/src/lib/grids/pivot-grid/pivot-grid.component.ts

@@ -103,7 +103,7 @@ import { IgxTextHighlightService } from '../../directives/text-highlight/text-hi
 import { IgxPivotRowHeaderGroupComponent } from './pivot-row-header-group.component';
 import { IgxPivotDateDimension } from './pivot-grid-dimensions';
 import { IgxPivotRowDimensionMrlRowComponent } from './pivot-row-dimension-mrl-row.component';
-import { IgxPivotGridRow } from 'igniteui-angular';
+import { IgxPivotGridRow } from  '../grid-public-row';
 
 let NEXT_ID = 0;
 const MINIMUM_COLUMN_WIDTH = 200;