package/mmc-utils: fix hash mismatch for readme file

Commit b03dc5: package/mmc-utils: bump to 523d8f3cfb21

The README hash changed causing a build failure:

https://github.com/skiffos/SkiffOS/actions/runs/12266361526/job/34224344838#step:8:60617

Update the hash for the README.md file to fix the issue.

Reproduce: make mmc-utils-legal-info

Signed-off-by: Christian Stewart <christian@aperture.us>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mmc-utils/mmc-utils.hash

@@ -1,3 +1,3 @@
 # Locally computed
 sha256  1ae5706ce56bfedda94a01e87c5151ac750fb849987aeb74ff89d70f43556131  mmc-utils-523d8f3cfb219d800f45860892e742e3a355f1bb-git4.tar.gz
-sha256  4207d81122a02555f78c5a11b61c83a331ee03dc933e1ef9dd932ef9b434d12d  README
+sha256  49cd65f67b516078ff7e0dbe639972dad21ed3858246e3969fc8a8fc2a4dca66  README