[upstream_utils] Remove Eigen intellisense fix (#7397)

FRC Code intellisense continued to work in developerRobot with a QR
decomposition.

Author: calcmogul

upstream_utils/eigen_patches/0002-Intellisense-fix.patch

@@ -174,13 +174,6 @@
 
 //----------------------------------------------------------------------
 
-// Disable vectorization in intellisense
-#ifdef __INTELLISENSE__
-#ifndef EIGEN_DONT_VECTORIZE
-#define EIGEN_DONT_VECTORIZE
-#endif
-#endif
-
 // if alignment is disabled, then disable vectorization. Note: EIGEN_MAX_ALIGN_BYTES is the proper check, it takes into
 // account both the user's will (EIGEN_MAX_ALIGN_BYTES,EIGEN_DONT_ALIGN) and our own platform checks
 #if EIGEN_MAX_ALIGN_BYTES == 0