[PATCH net v2 1/2] MAINTAINERS: Move M Chetan Kumar to CREDITS

[Bagas Sanjaya <bagasdotme@gmail.com>]

Emails to him bounce with 550 error code:

```
5.1.0 - Unknown address error 550-'5.1.1 <m.chetan.kumar@linux.intel.com>: Recipient address rejected: User unknown in virtual mailbox table'
```

It looks like he had left Intel, so move him to CREDITS.

Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
---
 He is still listed by scripts/get_maintainer.pl, though (due to significant
 contribution):

 ```
 $ scripts/get_maintainer.pl drivers/net/wwan/iosm/
 ...
 M Chetan Kumar <m.chetan.kumar@linux.intel.com> (commit_signer:15/23=65%,authored:14/23=61%)
 ...
 ```

 If no one steps up maintaining IOSM, should INTEL WWAN IOSM DRIVER entry
 be removed then to get rid of him, like in [1]?

 [1]: https://lore.kernel.org/lkml/20210316081000.12596-1-krzysztof.kozlowski@canonical.com/

 CREDITS     | 5 +++++
 MAINTAINERS | 2 --
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/CREDITS b/CREDITS
index f33a33fd237170..0472398b6aa7e9 100644
--- a/CREDITS
+++ b/CREDITS
@@ -2191,6 +2191,11 @@ D: pirq addr, CS5535 alsa audio driver
 S: Gurgaon, India
 S: Kuala Lumpur, Malaysia
 
+N: M Chetan Kumar
+E: <m.chetan.kumar@intel.com>
+D: Intel WWAN IOSM driver
+D: Mediatek T7XX 5G WWAN reviewer
+
 N: Mohit Kumar
 D: ST Microelectronics SPEAr13xx PCI host bridge driver
 D: Synopsys DesignWare PCI host bridge driver
diff --git a/MAINTAINERS b/MAINTAINERS
index 7a7bd8bd80e9f2..08a7be6a5680ed 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10879,7 +10879,6 @@ S:	Maintained
 F:	drivers/platform/x86/intel/wmi/thunderbolt.c
 
 INTEL WWAN IOSM DRIVER
-M:	M Chetan Kumar <m.chetan.kumar@intel.com>
 M:	Intel Corporation <linuxwwan@intel.com>
 L:	netdev@vger.kernel.org
 S:	Maintained
@@ -13504,7 +13503,6 @@ M:	Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>
 M:	Intel Corporation <linuxwwan@intel.com>
 R:	Chiranjeevi Rapolu <chiranjeevi.rapolu@linux.intel.com>
 R:	Liu Haijun <haijun.liu@mediatek.com>
-R:	M Chetan Kumar <m.chetan.kumar@linux.intel.com>
 R:	Ricardo Martinez <ricardo.martinez@linux.intel.com>
 L:	netdev@vger.kernel.org
 S:	Supported
-- 
An old man doll... just what I always wanted! - Clara