mailmap: update entry for Manivannan Sadhasivam

Remove the map for Linaro id as it is still in use and I want to use it
for submitting patches.  Otherwise, git uses kernel.org as the author id
for patches created using Linaro id.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Manivannan Sadhasivam <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

.mailmap

@@ -363,7 +363,6 @@ Maheshwar Ajja <[email protected]> <[email protected]>
 Malathi Gottam <[email protected]> <[email protected]>
 Manikanta Pubbisetty <[email protected]> <[email protected]>
 Manivannan Sadhasivam <[email protected]> <[email protected]>
-Manivannan Sadhasivam <[email protected]> <[email protected]>
 Manoj Basapathi <[email protected]> <[email protected]>
 Marcin Nowakowski <[email protected]> <[email protected]>
 Marc Zyngier <[email protected]> <[email protected]>