treewide: replace AUTORELEASE with real PKG_RELEASE

Based on Paul Fertser <fercerpav@gmail.com>'s guidance:
Change AUTORELEASE in rules.mk to:
```
AUTORELEASE = $(if $(DUMP),0,$(shell sed -i "s/\$$(AUTORELEASE)/$(call commitcount,1)/" $(CURDIR)/Makefile))
```

then update all affected packages by:
```
for i in $(git grep -l PKG_RELEASE:=.*AUTORELEASE | sed 's^.*/\([^/]*\)/Makefile^\1^';);
do
	make package/$i/clean
done
```

Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>

package/system/opkg/Makefile

@@ -7,7 +7,7 @@ include $(TOPDIR)/rules.mk
 include $(INCLUDE_DIR)/kernel.mk
 
 PKG_NAME:=opkg
-PKG_RELEASE:=$(AUTORELEASE)
+PKG_RELEASE:=2
 PKG_FLAGS:=essential
 
 PKG_SOURCE_PROTO:=git

package/system/ubox/Makefile

@@ -1,7 +1,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=ubox
-PKG_RELEASE:=$(AUTORELEASE)
+PKG_RELEASE:=2
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(PROJECT_GIT)/project/ubox.git

package/system/zram-swap/Makefile

@@ -5,7 +5,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=zram-swap
-PKG_RELEASE:=$(AUTORELEASE)
+PKG_RELEASE:=32
 
 PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)