[U-Boot] [PATCH v2 2/5] tpm: Add a constant for the minimum supported digest size

[sjg at google.com]

When SHA1 is used we need 20 bytes for the digest size. Add a constant so
that clients can make use of this, e.g. to allocate local buffers.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

Changes in v2:
- Split out from main TPM patch

 include/tpm-common.h | 2 ++
 1 file changed, 2 insertions(+)

Applied to u-boot-dm/master, thanks!