MAINTAINERS: ARM: nspire: add Krzysztof Kozlowski as maintainer

MAINTAINERS: ARM: nspire: add Krzysztof Kozlowski as maintainer

Apparently there was never a maintainers entry for the ARM Texas
Instruments Nspire SoC, thus patches end up nowhere.  Add such entry,
because even if platform is orphaned and on its way out of the kernel,
it is nice to take patches if someone sends something.

I do not plan to actively support/maintain Nspire platform but I can
take odd fixes now and then.

Cc: Daniel Tang <dt.tangr@gmail.com>
Cc: Andrew Davis <afd@ti.com>
Acked-by: Andrew Davis <afd@ti.com>
Link: https://lore.kernel.org/r/20240612141740.8470-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>