MAINTAINERS: update Sibi Sankar's email address

Switch to using oss.qualcomm.com email ID in the MAINTAINERS file.  Also
update mailmap to ensure proper attribution across historical commits.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Sibi Sankar <[email protected]>
Cc: Bjorn Andersson <[email protected]>
Cc: Carlos Bilbao <[email protected]>
Cc: Jarkko Sakkinen <[email protected]>
Cc: Shannon Nelson <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: QuinAsura

.mailmap

@@ -715,7 +715,8 @@ Shuah Khan <[email protected]> <[email protected]>
 Shuah Khan <[email protected]> <[email protected]>
 Shuah Khan <[email protected]> <[email protected]>
 Shuah Khan <[email protected]> <[email protected]>
-Sibi Sankar <[email protected]> <[email protected]>
+Sibi Sankar <[email protected]> <[email protected]>
+Sibi Sankar <[email protected]> <[email protected]>
 Sid Manning <[email protected]> <[email protected]>
 Simon Arlott <[email protected]> <[email protected]>
 Simona Vetter <[email protected]> <[email protected]>

MAINTAINERS

@@ -20710,7 +20710,7 @@ F:	Documentation/devicetree/bindings/power/avs/qcom,cpr.yaml
 F:	drivers/pmdomain/qcom/cpr.c
 
 QUALCOMM CPUCP MAILBOX DRIVER
-M:	Sibi Sankar <quic_sibis@quicinc.com>
+M:	Sibi Sankar <[email protected].com>
 L:	[email protected]
 S:	Supported
 F:	Documentation/devicetree/bindings/mailbox/qcom,cpucp-mbox.yaml