MAINTAINERS: Add vaishnavachath as maintainer for TI Platforms

Add myself as a maintainer for existing TI platforms,
currently I am an employee with Texas Instruments Inc. in
the Embedded Processors software department and has worked
on the supported simplelink platforms in Zephyr for the last
2 years.

Signed-off-by: Vaishnav Achath <vaishnav.a@ti.com>

CODEOWNERS

@@ -314,7 +314,7 @@
 /drivers/ieee802154/*b91*                 @andy-liu-telink
 /drivers/ieee802154/ieee802154_nrf5*      @jciupis
 /drivers/ieee802154/ieee802154_rf2xx*     @tbursztyka @nandojve
-/drivers/ieee802154/ieee802154_cc13xx*    @bwitherspoon @cfriedt
+/drivers/ieee802154/ieee802154_cc13xx*    @bwitherspoon @cfriedt @vaishnavachath
 /drivers/interrupt_controller/            @dcpleung @nashif
 /drivers/interrupt_controller/intc_gic.c  @stephanosio
 /drivers/interrupt_controller/*esp32*     @glaubermaroto

MAINTAINERS.yml

@@ -2051,7 +2051,9 @@ ITE Platforms:
     - "platform: ITE"
 
 TI Platforms:
-  status: odd fixes
+  status: maintained
+  maintainers:
+    - vaishnavachath
   collaborators:
     - vanti
     - cfriedt