MAINTAINERS: hfs/hfsplus: add myself as maintainer

I used to maintain Allwinner SoC cpufreq and thermal drivers and
have some work experience in the F2FS file system.

I volunteered to maintain the code together with Slava and Adrian.

Signed-off-by: Yangtao Li <frank.li@vivo.com>
Link: https://lore.kernel.org/20250423123423.2062619-1-frank.li@vivo.com


Acked-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Signed-off-by: Christian Brauner <brauner@kernel.org>