dt-bindings: qcom: update maintainers (drop Akash and Mukesh)

Emails to Akash Asthana and Mukesh Savaliya bounce (550: Recipient
address rejected: User unknown in virtual alias table), so switch
maintainer to Bjorn (as active Qualcomm platform maintainer).

Cc: Bjorn Andersson <[e-mail]>
Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Acked-by: Mark Brown <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/devicetree/bindings/soc/qcom/qcom,geni-se.yaml

···
 title: GENI Serial Engine QUP Wrapper Controller
 
 maintainers:
-  - Mukesh Savaliya <[e-mail]>
-  - Akash Asthana <[e-mail]>
+  - Bjorn Andersson <[e-mail]>
 
 description: |
  Generic Interface (GENI) based Qualcomm Universal Peripheral (QUP) wrapper

Documentation/devicetree/bindings/spi/qcom,spi-qcom-qspi.yaml

···
 title: Qualcomm Quad Serial Peripheral Interface (QSPI)
 
 maintainers:
-  - Mukesh Savaliya <[e-mail]>
-  - Akash Asthana <[e-mail]>
+  - Bjorn Andersson <[e-mail]>
 
 description: The QSPI controller allows SPI protocol communication in single,
   dual, or quad wire transmission modes for read/write access to slaves such