MAINTAINERS, mailmap: update Aditya Garg's email address

My Outlook email address often sends emails from kernel devs to the junk
folder. Also, emails from some addresses (eg suse.de) are not received
at all. Update the email to my alternate Proton Mail address.

Signed-off-by: Aditya Garg <gargaditya08@proton.me>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patch.msgid.link/20260424175846.15103-1-gargaditya08@proton.me

Author: AdityaGarg8

.mailmap

@@ -19,6 +19,7 @@ Abhinav Kumar <quic_abhinavk@quicinc.com> <abhinavk@codeaurora.org>
 Ahmad Masri <quic_amasri@quicinc.com> <amasri@codeaurora.org>
 Adam Oldham <oldhamca@gmail.com>
 Adam Radford <aradford@gmail.com>
+Aditya Garg <gargaditya08@proton.me> <gargaditya08@live.com>
 Adriana Reus <adi.reus@gmail.com> <adriana.reus@intel.com>
 Adrian Bunk <bunk@stusta.de>
 Ajay Kaher <ajay.kaher@broadcom.com> <akaher@vmware.com>

MAINTAINERS

@@ -7873,7 +7873,7 @@ F:	drivers/gpu/drm/sun4i/sun8i*
 
 DRM DRIVER FOR APPLE TOUCH BARS
 M:	Aun-Ali Zaidi <admin@kodeit.net>
-M:	Aditya Garg <gargaditya08@live.com>
+M:	Aditya Garg <gargaditya08@proton.me>
 L:	dri-devel@lists.freedesktop.org
 S:	Maintained
 T:	git https://gitlab.freedesktop.org/drm/misc/kernel.git