MAINTAINERS: switch to different email address

Switching to private mail account as work email is polluted with a legal
disclaimer. Just making it extra clear by changing the email address in
the MAINTAINERS file as well.
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: Arend van Spriel <aspriel@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20201220141807.17278-1-aspriel@gmail.com

MAINTAINERS

@@ -3545,7 +3545,7 @@ S:	Supported
 F:	drivers/net/ethernet/broadcom/bnxt/
 
 BROADCOM BRCM80211 IEEE802.11n WIRELESS DRIVER
-M:	Arend van Spriel <arend.vanspriel@broadcom.com>
+M:	Arend van Spriel <aspriel@gmail.com>
 M:	Franky Lin <franky.lin@broadcom.com>
 M:	Hante Meuleman <hante.meuleman@broadcom.com>
 M:	Chi-hsien Lin <chi-hsien.lin@infineon.com>