MAINTAINERS: update caam crypto driver maintainers list

Aymen steps down as caam maintainer, being replaced by Pankaj.
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

MAINTAINERS

@@ -7159,7 +7159,7 @@ F:	include/video/
 
 FREESCALE CAAM (Cryptographic Acceleration and Assurance Module) DRIVER
 M:	Horia Geantă <horia.geanta@nxp.com>
-M:	Aymen Sghaier <aymen.sghaier@nxp.com>
+M:	Pankaj Gupta <pankaj.gupta@nxp.com>
 L:	linux-crypto@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/crypto/fsl-sec4.txt