initramfs: Remove redundant dependency of RD_ZSTD on BLK_DEV_INITRD

Commit be1859b ("initramfs: remove redundant dependency on
BLK_DEV_INITRD") removed all redundant dependencies on BLK_DEV_INITRD,
but the recent addition of zstd support introduced a new one.

Fixes: a30d8a3 ("usr: Add support for zstd compressed initramfs")
Signed-off-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Masahiro Yamada <[email protected]>

Author: geertu

usr/Kconfig

@@ -103,7 +103,6 @@ config RD_LZ4
 config RD_ZSTD
 	bool "Support initial ramdisk/ramfs compressed using ZSTD"
 	default y
-	depends on BLK_DEV_INITRD
 	select DECOMPRESS_ZSTD
 	help
 	  Support loading of a ZSTD encoded initial ramdisk or cpio buffer.