arm/trusted-services: ts-sp-fw: Replace v2.7.0 tag with commit ID

Do so for the usual reason of avoiding network access during recipe
parsing. Occasionally parsing will stall for me as it seems connectivity
to trustedfirmware.org can be flaky.

Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
Signed-off-by: Jon Mason <jon.mason@arm.com>

meta-arm/recipes-security/trusted-services/ts-sp-fwu_git.bb

@@ -15,7 +15,7 @@ OECMAKE_SOURCEPATH="${S}/deployments/fwu/config/${TS_SP_FWU_CONFIG}-${TS_ENV}"
 
 # The GPT parser component is needed from TF-A
 SRC_URI += "git://git.trustedfirmware.org/TF-A/trusted-firmware-a.git;name=tfa;protocol=https;branch=master;destsuffix=git/tf-a"
-SRCREV_tfa = "v2.7.0"
+SRCREV_tfa = "35f4c7295bafeb32c8bcbdfb6a3f2e74a57e732b"
 LIC_FILES_CHKSUM = "file://../tf-a/docs/license.rst;md5=b2c740efedc159745b9b31f88ff03dde"
 do_apply_local_src_patches:append() {
     apply_local_src_patches ${S}/external/tf_a ${WORKDIR}/git/tf-a