Fix build with ENABLE_SHIM_CERT and ENABLE_SBSIGN: shim.key is created by the shim.crt target
Fix build with ENABLE_SHIM_CERT and ENABLE_SBSIGN: shim.key is created by the shim.crt target

Signed-off-by: Mathieu Trudel-Lapierre <bab670cc3de8a930dbcc4c98df4e7a8fdd9221c3@canonical.com>

rhinstaller/shim,rhinstaller/shim,rhinstaller/shim