MAINTAINERS: Add myself as maintainer of hisi_soc_hha

Add myself as maintainer of HiSilicon SoC HHA driver as I will be
responsible for this driver.

Signed-off-by: Yushan Wang <[e-mail]>
Acked-by: Jonathan Cameron <[e-mail]>
Signed-off-by: Conor Dooley <[e-mail]>
Link: https://lore.kernel.org/r/20260128-audition-professed-31d1b66d5b4e@spud
Signed-off-by: Arnd Bergmann <[e-mail]>

MAINTAINERS

···
 F:	drivers/soc/hisilicon/kunpeng_hccs.c
 F:	drivers/soc/hisilicon/kunpeng_hccs.h
 
+HISILICON SOC HHA DRIVER
+M:	Yushan Wang <[e-mail]>
+S:	Maintained
+F:	drivers/cache/hisi_soc_hha.c
+
 HISILICON LPC BUS DRIVER
 M:	Jay Fang <[e-mail]>
 S:	Maintained