MAINTAINERS: Add maintainers for ZynqMP NVMEM driver

Add maintainers for ZynqMP NVMEM driver and driver document.

Signed-off-by: Praveen Teja Kundanala <praveen.teja.kundanala@amd.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20240224114516.86365-9-srinivas.kandagatla@linaro.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>