vboot: remove compression_type constants

These are no longer needed after CL:367882.

BUG=b:124141368, chromium:968464
TEST=make clean && make runtests
BRANCH=none

Change-Id: I267d20054778a6565dc1ed0687ed0d2afa928463
Signed-off-by: Joel Kitching <kitching@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2108752
Tested-by: Joel Kitching <kitching@chromium.org>
Commit-Queue: Joel Kitching <kitching@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
diff --git a/firmware/include/vboot_api.h b/firmware/include/vboot_api.h
index 3f0e2ef..7e14134 100644
--- a/firmware/include/vboot_api.h
+++ b/firmware/include/vboot_api.h
@@ -576,14 +576,6 @@
 /* Shutdown requested due to a power button being pressed. */
 #define VB_SHUTDOWN_REQUEST_POWER_BUTTON	0x00000004
 
-/* Constants for compression_type */
-enum {
-	COMPRESS_NONE = 0,
-	COMPRESS_EFIv1,           /* The x86 BIOS only supports this */
-	COMPRESS_LZMA1,           /* The ARM BIOS supports LZMA1 */
-	MAX_COMPRESS,
-};
-
 enum VbAltFwIndex_t {
 	VB_ALTFW_DIAGNOSTIC = -1,
 	VB_ALTFW_DEFAULT = 0,