MAINTAINERS: Remove stale entry for SBL platform driver

Maurice is no longer with Intel and his e-mail address is no longer
active. Remove the stale entry from Slim boot loader section.

Signed-off-by: Jithu Joseph <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ilpo Järvinen <[email protected]>

Author: jithu83

MAINTAINERS

@@ -11025,7 +11025,6 @@ F:	drivers/net/wireless/intel/iwlwifi/
 
 INTEL WMI SLIM BOOTLOADER (SBL) FIRMWARE UPDATE DRIVER
 M:	Jithu Joseph <[email protected]>
-R:	Maurice Ma <[email protected]>
 S:	Maintained
 W:	https://slimbootloader.github.io/security/firmware-update.html
 F:	drivers/platform/x86/intel/wmi/sbl-fw-update.c