Merge: mfd: backport am3359 tscadc driver

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/5137

# Merge Request Required Information

## Summary of Changes
Backport am3359 tsc analog-digital converter driver  
  
Testing: adc files show up in /sys/devices/platform/bus@100000/bus@100000:bus@28380000/40210000.tscadc on TI J784 board.  
More thorough testing would require physical access to the pins that interface with the adc.  
  
Signed-off-by: Joel Slebodnick <[email protected]>  

## Approved Development Ticket
All submissions to CentOS Stream must reference an approved ticket in [Red Hat Jira](https://issues.redhat.com/). Please follow the CentOS Stream [contribution documentation](https://docs.centos.org/en-US/stream-contrib/quickstart/) for how to file this ticket and have it approved.  
JIRA: https://issues.redhat.com/browse/RHEL-51597

Approved-by: Andrew Halaney <[email protected]>
Approved-by: Eric Chanudet <[email protected]>
Approved-by: Mark Salter <[email protected]>
Approved-by: CKI KWF Bot <[email protected]>

Merged-by: Rado Vrbovsky <[email protected]>

Author: emmil

arch/arm/boot/dts/am33xx-l4.dtsi

@@ -263,6 +263,8 @@
 				compatible = "ti,am3359-tscadc";
 				reg = <0x0 0x1000>;
 				interrupts = <16>;
+				clocks = <&adc_tsc_fck>;
+				clock-names = "fck";
 				status = "disabled";
 				dmas = <&edma 53 0>, <&edma 57 0>;
 				dma-names = "fifo0", "fifo1";