MAINTAINERS: repair file entry for STARFIVE TRNG DRIVER

Commit c388f458 ("hwrng: starfive - Add TRNG driver for StarFive SoC")
adds the STARFIVE TRNG DRIVER section to MAINTAINERS, but refers to the
non-existing file drivers/char/hw_random/starfive-trng.c rather than to the
actually added file drivers/char/hw_random/jh7110-trng.c in this commit.

Hence, ./scripts/get_maintainer.pl --self-test=patterns complains about a
broken reference.

Repair this file entry in STARFIVE TRNG DRIVER.

Fixes: c388f458 ("hwrng: starfive - Add TRNG driver for StarFive SoC")
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Acked-by: Jia Jie Ho <jiajie.ho@starfivetech.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>