Allow changing the EROFS compressor.

This adds BOARD_EROFS_COMPRESSOR to change the compression algorithm
globally, and BOARD_{x}IMAGE_EROFS_COMPRESSOR to change it for
individual partitions.

Bug: N/A
Test: manual test
Change-Id: I2ef831558242a4070ee96269140c33b66c689351
diff --git a/core/Makefile b/core/Makefile
index a848630..8dba582 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1619,6 +1619,7 @@
 # $(2) the image prop file
 define add-common-ro-flags-to-image-props
 $(eval _var := $(call to-upper,$(1)))
+$(if $(BOARD_$(_var)IMAGE_EROFS_COMPRESSOR),$(hide) echo "$(1)_erofs_compressor"$(BOARD_$(_var)IMAGE_EROFS_COMPRESSOR)" >> $(2))
 $(if $(BOARD_$(_var)IMAGE_EXTFS_INODE_COUNT),$(hide) echo "$(1)_extfs_inode_count=$(BOARD_$(_var)IMAGE_EXTFS_INODE_COUNT)" >> $(2))
 $(if $(BOARD_$(_var)IMAGE_EXTFS_RSV_PCT),$(hide) echo "$(1)_extfs_rsv_pct=$(BOARD_$(_var)IMAGE_EXTFS_RSV_PCT)" >> $(2))
 $(if $(BOARD_$(_var)IMAGE_F2FS_SLOAD_COMPRESS_FLAGS),$(hide) echo "$(1)_f2fs_sldc_flags=$(BOARD_$(_var)IMAGE_F2FS_SLOAD_COMPRESS_FLAGS)" >> $(2))
@@ -1697,6 +1698,7 @@
 $(if $(INTERNAL_USERIMAGES_SPARSE_EROFS_FLAG),$(hide) echo "erofs_sparse_flag=$(INTERNAL_USERIMAGES_SPARSE_EROFS_FLAG)" >> $(1))
 $(if $(INTERNAL_USERIMAGES_SPARSE_SQUASHFS_FLAG),$(hide) echo "squashfs_sparse_flag=$(INTERNAL_USERIMAGES_SPARSE_SQUASHFS_FLAG)" >> $(1))
 $(if $(INTERNAL_USERIMAGES_SPARSE_F2FS_FLAG),$(hide) echo "f2fs_sparse_flag=$(INTERNAL_USERIMAGES_SPARSE_F2FS_FLAG)" >> $(1))
+$(if $(BOARD_EROFS_COMPRESSOR),$(hide) echo "erofs_default_compressor=$(BOARD_EROFS_COMPRESSOR)" >> $(1))
 $(if $(BOARD_EXT4_SHARE_DUP_BLOCKS),$(hide) echo "ext4_share_dup_blocks=$(BOARD_EXT4_SHARE_DUP_BLOCKS)" >> $(1))
 $(if $(BOARD_FLASH_LOGICAL_BLOCK_SIZE), $(hide) echo "flash_logical_block_size=$(BOARD_FLASH_LOGICAL_BLOCK_SIZE)" >> $(1))
 $(if $(BOARD_FLASH_ERASE_BLOCK_SIZE), $(hide) echo "flash_erase_block_size=$(BOARD_FLASH_ERASE_BLOCK_SIZE)" >> $(1))