grpc: Define SRCREV_FORMAT
grpc: Define SRCREV_FORMAT

Since it uses multiple fetch URIs make it explicit to define SRCREV_FORMAT

Signed-off-by: Andreas Weger <weger@hs-mittweida.de>

Change-Id: Ib24fce16b3986a465f1c5854166b8f28446b5186
Signed-off-by: Armin Kuster <525edcd226fb27e7f47fbb319a38fe989c677548@gmail.com>

victronenergy/meta-openembedded,victronenergy/meta-openembedded,victronenergy/meta-openembedded,victronenergy/meta-openembedded,victronenergy/meta-openembedded,victronenergy/meta-openembedded,victronenergy/meta-openembedded