kernel: kmod-lib-zstd: enable crypto API support

Zstd is supported by the crypto API since Linux 4.18. Enable this feature and
reveal the package in the configuration section, so the user can select it.
This allows zstd to be used as a compression algorithm in zram, for example.

Signed-off-by: Rui Salvaterra <[email protected]>

package/kernel/linux/modules/lib.mk

@@ -124,16 +124,18 @@ $(eval $(call KernelPackage,lib-lzo))
 define KernelPackage/lib-zstd
   SUBMENU:=$(LIB_MENU)
   TITLE:=ZSTD support
+  DEPENDS:=+kmod-crypto-acompress
   KCONFIG:= \
+	CONFIG_CRYPTO_ZSTD \
 	CONFIG_ZSTD_COMPRESS \
 	CONFIG_ZSTD_DECOMPRESS \
 	CONFIG_XXHASH
-  HIDDEN:=1
   FILES:= \
+	$(LINUX_DIR)/crypto/zstd.ko \
 	$(LINUX_DIR)/lib/xxhash.ko \
 	$(LINUX_DIR)/lib/zstd/zstd_compress.ko \
 	$(LINUX_DIR)/lib/zstd/zstd_decompress.ko
-  AUTOLOAD:=$(call AutoProbe,xxhash zstd_compress zstd_decompress)
+  AUTOLOAD:=$(call AutoProbe,xxhash zstd zstd_compress zstd_decompress)
 endef
 
 define KernelPackage/lib-zstd/description