ramips: rename mtk-hsdma to hsdma-mt7621

Follows upstream rename:
https://lore.kernel.org/driverdev-devel/[email protected]/

Fixes ramips builds on 5.4.102

Cc: John Audia <[email protected]>
Cc: David Bauer <[email protected]>
Cc: Petr Štetiar <[email protected]>
Signed-off-by: Ilya Lipnitskiy <[email protected]>

target/linux/ramips/modules.mk

@@ -101,8 +101,8 @@ define KernelPackage/hsdma-mtk
 	CONFIG_MTK_HSDMA
   FILES:= \
 	$(LINUX_DIR)/drivers/dma/virt-dma.ko \
-	$(LINUX_DIR)/drivers/staging/mt7621-dma/mtk-hsdma.ko
-  AUTOLOAD:=$(call AutoLoad,53,mtk-hsdma)
+	$(LINUX_DIR)/drivers/staging/mt7621-dma/hsdma-mt7621.ko
+  AUTOLOAD:=$(call AutoLoad,53,hsdma-mt7621)
 endef
 
 define KernelPackage/hsdma-mtk/description