meta-google: hoth: Remove SRCREV override

The SRCREV now matches
https://github.com/openbmc/openbmc/blob/b3415dd342accf1b4b75d2aa5b041d24cc0c7783/meta-security/meta-tpm/recipes-tpm1/hoth/libhoth_git.bb#L4
and the override is not needed anymore.

Change-Id: I785497b05c5c224c6b224fb1e6180a0bfdea50fa
Signed-off-by: Willy Tu <wltu@google.com>
diff --git a/meta-google/recipes-tpm/hoth/libhoth_%.bbappend b/meta-google/recipes-tpm/hoth/libhoth_%.bbappend
deleted file mode 100644
index 8d57437..0000000
--- a/meta-google/recipes-tpm/hoth/libhoth_%.bbappend
+++ /dev/null
@@ -1 +0,0 @@
-SRCREV:gbmc = "769296220dc88df33f4726aa11e39e049257b3c4"