MAINTAINERS: Add TPM DT bindings to TPM maintainers

Bindings for a given device class generally go to the respective
subsystem maintainers. Add the TPM bindings to the TPM
maintainers entry.
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.ogr>
Link: https://lore.kernel.org/r/20240130215917.2473250-1-robh@kernel.orgSigned-off-by: Rob Herring <robh@kernel.org>

MAINTAINERS

@@ -22384,6 +22384,7 @@ S:	Maintained
 W:	https://kernsec.org/wiki/index.php/Linux_Kernel_Integrity
 Q:	https://patchwork.kernel.org/project/linux-integrity/list/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd.git
+F:	Documentation/devicetree/bindings/tpm/
 F:	drivers/char/tpm/
 
 TPS546D24 DRIVER